Wednesday, February 8, 2017

Social Sciences (disciplines and subfields)

What is social science?

It is the study of human behavior & interactions with findings supported and verified through the scientific method.



Sociology

Sociology focusing on how our humanity is shaped and constrained by social context within which we live our lives

society is the external, visible activities of people in cultural groups – our collective form of survival
culture is the internal rules and knowledge they have that enable them to behave in an organized fashion
social behavior includes relations, roles, and whatever people do, make, think, feel, and believe that is collective
Social groups: associations – a general term for organizations in society, such as age groups, guilds, clubs … (can be voluntary, ascribed … )
Status groups – class, caste, rank


Power – authority or ability to make decisions and control others/resources. power is the ability to influence or outright control the behavior of people. 

Social Power - One's decision that affects the society.

Status – prestige; rank in a hierarchy. Status is about how you are viewed by society. 
Family – not quite the same for all (examples of kinds of family)

Classrefers to a group in society who share common level of access to wealth, opportunity, possessions and power/authority. Class is a catogorization about economics and lifestyle. 

Subfield

Social stratification is a society's categorization of people into socioeconomic strata, based upon their occupation and incomewealth and social status, or derived power (social and political).

Socialization  the process of learning to behave in a way that is acceptable to society. Adapt to the environment of the society. For example, Tarzan live and born in the jungle, he does not interact with humans, instead he interact with animals. Therefore, he became and behave like them. 

Political Sociology Contemporary political sociology involves, but is not limited to, the study of the relations between statesociety, and citizens. For example, Where a typical research question in political sociology might have been "Why do so few American or European citizens choose to vote?" or even "What difference does it make if women get elected?", political sociologists also now ask: "How is the body a site of power?", "How are emotions relevant to global poverty?", or "What difference does knowledge make to democracy?".

Criminology (from Latin crīmen, "accusation"; and Greek -λογία-logia) is the scientific study of the nature, extent, management, causes, control, consequences, and prevention of criminal behavior, both on the individual and social levels. 

Demography  is the statistical study of populations, especially human beings. As a very general science, it can analyse any kind of dynamic living population, i.e., one that changes over time or space (see population dynamics). Demography encompasses the study of the size, structure, and distribution of these populations, and spatial or temporal changes in them in response to birthmigrationageing, and death. Based on the demographic research of the earth, earth's population up to the year 2050 and 2100 can be estimated by demographers. Demographics are quantifiable characteristics of a given population.


Anthropology

 initially differentiated from sociology in its focus on pre-modern communities, but now more characterized by its research traditions of immersive fieldwork and symbolic meanings more broadly. Anthropology is the study of the human as at once an individual, a product of society, and a maker of history and culture. It’s the nature of the human condition to live within structures of symbol, belief, and power of our own fashioning: religion, art, gender, war, ecosystems, race relations, embodiment, kinship, science, colonialism, language, nations and states, play, subsistence strategies, mass media, illness, pain, and pleasure. In a word, culture. And anthropologists study all this and more. Anthropology is the scientific study of humans and their cultural, social, biological, and environmental aspects of life in the past and the present. 

Subfields, Concept

Archaeology is the study of human activity through the recovery and analysis of material culture. The archaeological record consists of artifactsarchitecturebiofacts or ecofacts, and cultural landscapes

Physical anthropology, is a scientific discipline concerned with the biological and behavioral aspects of human beings, their related non-human primates and their extinct hominin ancestors. Study of human biological origins, involved today genetic studies, evolutionary studies.


Cultural Anthropology: Concerns itself with all facets of human culture; kinship, 
linguistics, 
material artifacts. Cultural anthropology is a branch of anthropology focused on the study 
of cultural variation among humans. Cultural anthropologists specialize in the study of
 culture and peoples’ beliefs, practices, and the cognitive and social organization of human
 groups. 
Cultural anthropologists study how people who share a common cultural system organize 
and shape the physical and social world around them, and are in turn shaped by those 
ideas, behaviors, and physical environments.


Economics


Economics is a social science that seeks to analyze and describe the production, distribution, and 
consumption of wealth. Economics is the social science that is concerned with the production, distribution, and consumption of goods and services. Economics aims to 
explain how economies work and how economic agents interact.

Economists focus on how people behave in markets, 
how markets tend to behave, – labour markets, markets
 for goods and services, etc – and how human behavior 
generates market related phenomena like inflation, rates 
of economic  growth/decline, business cycles, 
depressions, etc.



Subfields



Microeconomics (from Greek prefix mikro- meaning "small") is a branch of economics that 

studies the

 behavior of individuals and firms in making decisions regarding the allocation of scarce 

resources and 

the interactions among these individuals and firms. Microeconomics is the study of 

economics at an individual, group or company level. This could mean studying 

the supply and demand for a specific product, the production that an individual 

or business is capable of, or the effects of regulations on a business.


Macroeconomics (from the Greek prefix makro- meaning "large" and economics) is a branch of economics dealing with the performance, structure, behavior, and decision-making of an economy as a whole. This includes national, regional, and global economies. Examples are inflation, price levels, rate of growth, national income, gross domestic product and changes in unemployment.

socioeconomics (also known as social economics) is the social science that studies how economic activity affects and is shaped by social processes. 


Political Science

Politics focusing on the way that power and influence is articulated, particularly within the governing institution of nation states.

Subfields


Political theory, is the study of topics such as politicslibertyjusticepropertyrightslaw, and the enforcement of a legal code by authority . Political theorists tend to focus more on theoretical claims rather than empirical claims about the nature of the politicsNormative political theory is concerned with questions about such concepts as justice, equality, and rights. Historical political theory engages political philosophers from the past (e.g. Thucyides and Plato) to the present.  Political philosophy has its beginnings in ethics: in questions such as what kind of life is the good life for human beings. how to deploy or limit public power so as to maintain the survival and enhance the quality of human life. 

What they are, why (or even if) they are needed, what, if anything, makes a government legitimate, what rights and freedoms it should protect and why, what form it should take and why, what the law is, and what duties citizens owe to a legitimate government, if any, and when it may be legitimately overthrown, if ever.

Political economy focusing on how human societies and the international order are shaped by its processes of material production and distribution. Political economy is a term used for studying production and trade, and their relations with law, custom, and government, as well as with the distribution of national income and wealth.

International relations is an academic and a public policy field, and so can be positive and normative, because it analyzes and formulates the foreign policy of a given State. International Relations is the study of political relations between nation-states. It includes the study of diplomacy, military conflict, and conflict resolution, as well as the international political economy, international organizations, and other processes that operate across the boundaries of nation-states.

Public Policy is a very broad field of study that explores substantive policy areas as well as the procedurs of policy making. Examples of substantive areas include social welfare policy, communications policy, and morality policy. Government policies that affect the whole population

Psychology
Psychology is the study of the human (and animal) mind and how it affects behavior and physical processes (what makes us blush, smile, become tense, etc)

Subfields


Biological Psychology - studies how human behavior is related to physical-chemical-electrical processes in the mind. It is the application of the principles of biology to the study of physiologicalgenetic, and developmental mechanisms of behavior in humans and other animals. Biological psychology is concerned primarily with the relationship between psychological processes and the underlying physiological events—or, in other words, the mind-body phenomenon. Its focus is the function of the brain and the rest of the nervous system in activities (e.g., thinking, learning, feeling, sensing, and perceiving) recognized as characteristic of humans and other animals. Behaviour (whether human or animal) is driven by genetics and a person’s biological / chemical composition. It assumes that the environment cannot change your behaviour and that your actions, decisions and the way you live can be traced back to stemming from your parents, from which you inherited your genes.

Behavioral Psychology, studies the way people and animals respond to external stimulus. Behavioral psychology is the study of the connection between our minds and our behaviorBehavioral psychology is a branch of psychology that focuses on the study and alteration of people's behaviors, including their actions, emotions and thoughts. Assumes that our behaviour is a product of our interaction with the environment. Socialization.

Social Psychology, studies human behavior in groups and how these influence an individual’s behavior and the development of his/her belief system. 

Tuesday, February 7, 2017

Some study questions

Question: A patient has low platelet count. What would happen to this patient if he accidentally cuts himself?

Ans: The function of the platelet is to carry blood clotting chemical, so if a person has low platelet count and accidentally cuts himself, his wounds will recover much slower compared to normal people, as his blood clotting process will be slower.

Question: What happens when blood vessels in a person with normal platelet count are damaged? 

Ans: When blood vessels in a person with normal platelet count are damaged, blood clotting will take place to heal the damaged area. 

Small blood cells called platelets stick to the site of injury and spread along the surface of the blood vessel to stop the bleeding.

Chemical signals are released from small sacs inside the platelets that attract other cells to the area and make them clump together to form what is called a platelet plug.

On the surface of these activated platelets, many different clotting factors work together in a series of complex chemical reactions (known as the coagulation cascade) to form a fibrin clot. The clot acts like a mesh to stop the bleeding.

Inflammation

The function of inflammation is to eliminate the initial cause of cell injury, clear out necrotic cells and tissues damaged from the original insult and the inflammatory process, and to initiate tissue repair.
The classical signs of inflammation are heat, pain, redness, swelling, and loss of function. Inflammation is a generic response, and therefore it is considered as a mechanism of innate immunity, as compared to adaptive immunity, which is specific for each pathogen.[2] Too little inflammation could lead to progressive tissue destruction by the harmful stimulus (e.g. bacteria) and compromise the survival of the organism. In contrast, chronic inflammation may lead to a host of diseases, such as hay feverperiodontitisatherosclerosisrheumatoid arthritis, and even cancer (e.g., gallbladder carcinoma). Inflammation is therefore normally closely regulated by the body.

About heart


How Heart works?

The heart has two sides, separated by an inner wall called the septum. The right side of the heart pumps blood to the lungs to pick up oxygen. The left side of the heart receives the oxygen-rich blood from the lungs and pumps it to the body.

The heart has four chambers and four valves and is connected to various blood vessels. Veins are blood vessels that carry blood from the body to the heart. Arteries are blood vessels that carry blood away from the heart to the body.



Heart Chambers

The heart has four chambers or "rooms."
  • The atria (AY-tree-uh) are the two upper chambers that collect blood as it flows into the heart.
  • The ventricles (VEN-trih-kuhls) are the two lower chambers that pump blood out of the heart to the lungs or other parts of the body.

Heart Valves

Four valves control the flow of blood from the atria to the ventricles and from the ventricles into the two large arteries connected to the heart.
  • The tricuspid (tri-CUSS-pid) valve is in the right side of the heart, between the right atrium and the right ventricle.
  • The pulmonary (PULL-mun-ary) valve is in the right side of the heart, between the right ventricle and the entrance to the pulmonary artery. This artery carries blood from the heart to the lungs.
  • The mitral (MI-trul) valve is in the left side of the heart, between the left atrium and the left ventricle.
  • The aortic (ay-OR-tik) valve is in the left side of the heart, between the left ventricle and the entrance to the aorta. This artery carries blood from the heart to the body.
Valves are like doors that open and close. They open to allow blood to flow through to the next chamber or to one of the arteries. Then they shut to keep blood from flowing backward.
When the heart's valves open and close, they make a "lub-DUB" sound that a doctor can hear using a stethoscope.
  • The first sound—the "lub"—is made by the mitral and tricuspid valves closing at the beginning of systole (SIS-toe-lee). Systole is when the ventricles contract, or squeeze, and pump blood out of the heart.
  • The second sound—the "DUB"—is made by the aortic and pulmonary valves closing at the beginning of diastole (di-AS-toe-lee). Diastole is when the ventricles relax and fill with blood pumped into them by the atria.

What are heart valves?

The heart consists of four chambers, two atria (upper chambers) and two ventricles (lower chambers). There is a valve through which blood passes before leaving each chamber of the heart. The valves prevent the backward flow of blood. These valves are actual flaps that are located on each end of the two ventricles (lower chambers of the heart). They act as one-way inlets of blood on one side of a ventricle and one-way outlets of blood on the other side of a ventricle. Each valve actually has three flaps, except the mitral valve, which has two flaps. The four heart valves include the following:
  • tricuspid valve: located between the right atrium and the right ventricle
  • pulmonary valve: located between the right ventricle and the pulmonary artery
  • mitral valve: located between the left atrium and the left ventricle
  • aortic valve: located between the left ventricle and the aorta

How do the heart valves function?

As the heart muscle contracts and relaxes, the valves open and shut, letting blood flow into the ventricles and atria at alternate times. The following is a step-by-step illustration of how the valves function normally in the left ventricle:
  • After the left ventricle contracts, the aortic valve closes and the mitral valve opens, to allow blood to flow from the left atrium into the left ventricle.
  • As the left atrium contracts, more blood flows into the left ventricle.
  • When the left ventricle contracts again, the mitral valve closes and the aortic valve opens, so blood flows into the aorta.

What is heart valve disease?

Heart valves can have one of two malfunctions:
  • regurgitation
    The valve(s) does not close completely, causing the blood to flow backward instead of forward through the valve.
  • stenosis
    The valve(s) opening becomes narrowed or does not form properly, inhibiting the flow of blood out of the ventricle or atria. The heart is forced to pump blood with increased force in order to move blood through the stiff (stenotic) valve(s).
Heart valves can have both malfunctions at the same time (regurgitation and stenosis). When heart valves fail to open and close properly, the implications for the heart can be serious, possibly hampering the heart’s ability to pump blood adequately through the body. Heart valve problems are one cause of heart failure.

Arteries

The arteries are major blood vessels connected to your heart.
  • The pulmonary artery carries blood from the right side of the heart to the lungs to pick up a fresh supply of oxygen. (Right side of heart ---> Lung ---> Pick up oxygen)
  • The aorta is the main artery that carries oxygen-rich blood from the left side of the heart to the body. (left side of heart ---> body, for providing oxygen)
  • The coronary arteries are the other important arteries attached to the heart. They carry oxygen-rich blood from the aorta to the heart muscle, which must have its own blood supply to function. (left side of heart ---> heart muscle)

pericardiumthe membrane enclosing the heart, consisting of an outer fibrous layer and an inner double layer of serous membrane. It is a double-walled sac containing the heart and the roots of the great vessels. The pericardial sac has two layers, a serous layer and a fibrous layer. It encloses the pericardial cavity which contains pericardial fluid.

myocardium -  is the muscle tissue of the heart

endocardium - is the innermost layer of tissue that lines the chambers of the heart.


Systemic circulation is the part of the cardiovascular system which carries oxygenated blood away from the heart to the body, and returns deoxygenated blood back to the heart. 

Pulmonary circulation is the portion of the cardiovascular system which carries deoxygenated blood away from the heart, to the lungs, and returns oxygenated (oxygen-rich) blood back to the heart. The term pulmonary circulation is readily paired and contrasted with the systemic circulation.


Pulmonary circulation process
Pulmonary circulation is the movement of blood from the heart, to the lungs, and back to the heart again. Deoxygenated blood leaves the heart, goes to the lungs, and then re-enters the heart; Deoxygenated blood leaves through the right ventricle through the pulmonary artery. From the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle. Blood is then pumped from the right ventricle through the pulmonary valve and into the pulmonary trunk of the pulmonary artery.

From the right ventricle, blood is pumped through the pulmonary semi-lunar valve into the left and right pulmonary arteries (one for each lung) and travels through the lungs.

The pulmonary arteries carry deoxygenated blood to the lungs, where carbon dioxide is released and oxygen is picked up during respiration. Arteries are further divided into very fine capillaries which are extremely thin-walled. Their function is to assist in the carrying of blood to all cells of the body. The pulmonary vein returns oxygenated blood to the left atrium of the heart.

The oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. This blood then enters the left atrium, which pumps it through the bicuspid valve, also called the mitral or left atrioventricular valve, into the left ventricle. From the left ventricle the blood passes through the aortic valve to the aorta. The blood is then distributed to the body through the systemic circulation before returning again to the pulmonary circulation.

Rhesus

Blood tests is to find out your blood group (A, B, AB or O) and your rhesus status (positive or negative)

Your rhesus factor is fixed by your genes. If you're rhesus positive (RhD positive), it means that a protein (D antigen) is found on the surface of your red blood cells. If you do not have the D antigen, you will be rhesus negative (RhD negative). 

Most people are rhesus positive.

http://www.babycentre.co.uk/a568837/what-is-my-rhesus-status-and-how-will-it-affect-my-pregnancy#ixzz4Y3vCTnaO


What does it mean if I'm Rhesus negative?

Rhesus status only matters if you are a rhesus-negative mum who is carrying a rhesus-positive baby. Your child will have inherited her rhesus-positive status from her rhesus-positive dad. 

If some of your baby's blood enters your bloodstream, your immune system may react to the D antigen in your baby's blood. It will be treated as a foreign invader and your body will produce antibodies against it. This is known as a sensitising event or being sensitised. 

Sensitising is not usually harmful if it is your first pregnancy. But it can cause problems if you become pregnant again with another rhesus-positive baby. The antibodies that your body made in your first pregnancy can quickly multiply, cross the placenta and attack the blood cells of your baby. 

The good news is that, because of routine injections of a substance called anti-D immunoglobulin (anti-D) to guard against the harmful effects of antibodies, complications are rare. 

However, if you are not treated with anti-D, the immune response in your second pregnancy will be stronger than the first pregnancy and can cause rhesus disease in your baby. Your antibodies start to attack your baby's blood cells during pregnancy and can carry on attacking them for a few months after the birth.

When your baby's blood cells are attacked, rhesus disease causes anaemia. If the anaemia becomes severe, it can lead to life-threatening problems for your baby, such as heart failure, fluid retention and swelling

After she’s born, your baby's liver won't be able to cope with the volume of blood cells that need breaking down. She may then become jaundiced, which is called haemolytic disease of the fetus and newborn (HDFN), or haemolytic disease of the newborn (HDN). 

In severe cases, HDFN can cause permanent brain damage and neurological problems in your baby, such as cerebral palsy, and physical or speech problems


http://www.babycentre.co.uk/a568837/what-is-my-rhesus-status-and-how-will-it-affect-my-pregnancy#ixzz4Y3w3Uby0


What do anti-D injections do?

Having an injection of anti-D can prevent your system from making antibodies. It's important to prevent antibodies from being made, because once they're produced, they stay in your blood forever. 

Anti-D works by rapidly destroying any fetal blood cells in your circulation before you can make antibodies. This means that you will not have antibodies in your system to cause haemolytic disease (HDFN) in this or your next pregnancy. 

http://www.babycentre.co.uk/a568837/what-is-my-rhesus-status-and-how-will-it-affect-my-pregnancy#ixzz4Y3vlxeXL

Saturday, February 4, 2017

Trachea (incomplete research)

The trachea, colloquially called the windpipe, is a cartilaginous tube that connects the pharynx and larynx to the lungs, allowing the passage of air, and so is present in almost all air-breathing animals with lungs. The trachea extends from the larynx and branches into the two primary bronchi. At the top of the trachea the cricoid cartilage attaches it to the larynx.