Answer the following 5 questions:   1)Uptake of calcium from the intestine is regulated most directly by

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Answer the following 5 questions:

 

1)Uptake of calcium from the intestine is regulated most directly by...

a. Cortisol

b. Thyroxine

c. Calcitonin

d. Parathyroid hormone

e. Vitamin D3

 

2) A woman goes to her doctor because she has been feeling depressed, developing large pads

of fat around her abdomen and shoulders, and having wounds that don't heal well. Her blood

is drawn and analyzed, and she is found to have very high plasma levels of both cortisol and

adrenocorticotropic hormone (ACTH). The patient most likely has...

a. An adrenal tumor that hypersecretes cortisol

b. A pituitary tumor that hypersecretes ACTH

c. A hypothalamic tumor that hypersecretes corticotropin-releasing hormone (CRH)

d. Hypothalamic damage that blocks secretion of CRH

e. Nothing wrong with her hypothalamic-pituitary-adrenal axis; her symptoms are caused by

some other problem

 

3) Which of the following is true of both steroid hormones and thyroid hormones?

a. They are synthesized from cholesterol.

b. They are secreted as soon as they are synthesized.

c. They are mostly bound to carrier proteins while circulating in the blood.

d. They usually enter target cells by simple diffusion across the plasma membrane.

e. All of the above.

 

4) By definition, hormones...

a. Are produced by cells specialized for hormone secretion

b. Circulate in the blood

c. Enter the cytoplasm of target cells

d. Act on target cells adjacent to the cells that secrete them

e. Are controlled by the nervous system

 

5) A man with very low iodine in his diet, but whose hypothalamic-pituitary-thyroid axis is

otherwise working normally, would be likely to have...

a. High thyroxine and high thyroid-stimulating hormone (TSH) levels

b. Low thyroxine and low TSH levels

c. High thyroxine and low TSH levels

d. Low thyroxine and high TSH levels

e. All of the above