Reference no: EM133471630

Assignment:

1. In young men, the growth of facial hair begins at the same time as blood testosterone levels start to increase. From this evidence, can you conclude that testosterone causes facial hair growth? Justify your answer.

2. List five male sex hormones and explain what they do in males.

3. Should a potential endocrine disruptor be considered "guilty until proven innocent" or "innocent until proven guilty" before being put on the market? Justify your response.

4. What would you need to know to link a particular substance to specifi c endocrine disrupting effects in a population, such as unusually high cancer rates?

5. In what ways does the fetal period of development differ from the embryonic period of development?

6. During which trimester do the following events occur?

a) heart starts beating

b) the body is larger in proportion to the head

c) fatty tissues are deposited beneath the skin

d) brain cells are connecting to form more intricate networks

e) external reproductive organs are distinguishable as male or female

f) eyelashes form

g) contractions felt by the mother signal the onset of labour

h) skin appears wrinkled i) nervous system starts to function

j) external reproductive organs are present but not distinguishable as male or female

k) the fetus produces urine l) the fetus adopts the "fetal position"

m) blood cells and major blood vessels start to form

n) the head is larger in proportion to the body

7. a) Which of the following is not a teratogen: x-rays, folic acid, alcohol, mercury, HIV, nicotine, tetracycline (an antibiotic), vitamin C?

b) Explain why the answer you chose in (a) is not a teratogen and why the others are.

8. What is parturition?

9. a) How many stages of parturition are there?

b) Describe what occurs during each of these stages.

10. Describe two hormonal changes that occur in the mother's body as parturition occurs.

11. Outline how hormones are involved in lactation and the suckling refl ex.