XERCISE 2 Circulatory system UESTION 1 Know the basics
Complete each sentence.
1.1.1 Blood carries ... and ... to cells.
1.1.2 Blood removes a gas called ... from the cells.
1.1.3 Blood vessels called ... transport blood towards the heart.
1.1.4 Blood vessels called ... transport blood away from the heart.
1.1.5 The smallest blood vessels in the circulatory system are called ...
For the circulatory system:
1.2.1 list the main components of the system
1.2.3 state the main functions of the system.
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1. oxygen and nutrients - blood carries oxygen and nutrients and transports it to the cells located in different parts of the body.

2. After transporting the oxygen and nutrients to the cell blood picks the carbon dioxide gas from the cell that is produced by the cellular respiration and transports it to the lungs to breathe out from the body.

3. Veins are the blood vessels that carry blood towards the heart from the various part of the body it carries deoxygenated blood.

4. Arteries are the blood vessels that carry oxygenated or oxygen-rich blood away from the heart to the different parts of the body.

5. Capillaries are the smallest blood vessels that get blood from the arterioles and are can be seen only under the microscope.

The list of main components of the circulatory system are :

Heart - that pumps or pushes blood throughout the body of the organism.

Blood - medium of transporting the oxygen and nutrients and have cells with different functions.

Blood vessels - are the tiny tube-like structures that carry blood to and from the heart.

The main function of the circulatory system is to transport oxygen and nutrients to provide the cells fuel for their cellar functions by performing cellular respiration.

as university of miami psychologists debra lieberman and adam smith pointed out in a recent article in the journal current directions in psychological science, humans have social and psychological mechanisms to deter incest. with very few exceptions, marriages between brothers and sisters and between parents and their children are verboten in every human culture. the primary psychological anti-incest mechanism is the yuck response. even the idea of sex with their mom or dad, bro or sis is upsetting to most people. the psychologist jonathan haidt has found that nearly everyone is repelled by the prospect of brother-sister sex, even in hypothetical situations in which there is no chance of pregnancy).

the biological cost of incest

this raises an interesting question: just what’s so bad about incest? sure, having sex with your dad or your sister seems gross — but why? some anthropologists have argued that incest taboos are learned social conventions. this explanation, however, doesn’t make sense to me as it does not explain the widespread existence of anti-incest mechanisms in creatures ranging from cockroaches to chimpanzees. second, the incest taboo is about as close to a universal law as human moral rules get.

why should mechanisms to avoid incest be so widespread both in nature and across human societies? the answer is simple. the problem with having sex close with relatives is that there is an astonishingly high chance that your offspring will be born with a serious birth defect.

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