5. Which of the following adrenal horm A. Cortisol. Aldosterone·YOOJOI830 ??????

Question

5. Which of the following adrenal horm A. Cortisol. Aldosterone·YOOJOI830 ??????? 8rD Androgens. E. Estrogens. In primary hyposecretion of thyroid hormones A. Levels of thyroid hormones in the B. Levels of TRH in the blood decrease C. Levels of TSH in the blood decre All of the above are true. None of the above is true D. E. 7. The important feature of the target cells that atlows them to respond to hormones is the: Proximity to the source of the horm B. Type of nerve supply of the target cell. C. Type of nerve supply to the target cell. Presence of appropriate receptor E. Surface area of the target cel membrane. A.o ort to l et a D. 8. Which of the following is an example of permissiveness? A. Glucagon increases blood glucose levels, and insulin decre levels B. Glucagon, epinephrine, and cortisol all increase blood glucose leve'ls Estrogen stimulates synthesis of progesterone receptors in the D. All of the above. E. None of the above. 9. The placenta not only serves as an organ of exchange but also secretes l of tfe nly serves as an organ of exchange but also secretes all of the following hormones, EXCEPT A. Prolactin. B. Chorionic gonadotropin C. Placental lactogen D. Progesterone E. Estrogen

Explanation / Answer

5) C. Epinephrine.

The chromaffin cells of the adrenal medulla secrete catecholamines, adrenaline (also called epinephrine), noradrenaline (also called norepinephrine) and dopamine, which are synthesized from the amino acid tyrosine

6) E. None of the above is true

If the level of thyroxin is less than normal, it stimulates hypothalamus to produce more TSH-RF, simulates release of TSH by the anterior pituitary lobe. In turn, TSH excites thyroid to produce more thyroxin to raise its level in blood.

7) D. Presence of appropriate receptor molecules

8) B. Glucagon, epinephrine and cortisol all increase blood glucose level.

9) A. Prolactin

Anterior pituitary glands secretes prolactin

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