Question

1. the thymus is indicated by ______.

figure 9.1
a) a
b) f
c) j
d) e
e) h

1. some people purchase melatonin as an over - the - counter medication. for what specific purpose?

a) sleep aid
b) growth of hair and nails
c) blood glucose regulation
d) increase metabolism

1. which hormone causes the kidneys to reabsorb more water from forming urine and as a result, increases blood volume?

a) cortisol
b) thyroid - stimulating hormone (tsh)
c) antidiuretic hormone (adh)
d) insulin

1. which hormone appears to play an important role in establishing the bodys sleep - wake cycle?

a) melanin
b) melatonin
c) cortisol
d) thymosin

Explanation:

1. The thymus is a small gland located in the upper chest, just below the thyroid gland, which corresponds to label E.
2. Melatonin is a hormone naturally produced in the body to regulate sleep; over-the-counter melatonin is used to help with sleep issues.
3. Antidiuretic hormone (ADH) acts on the kidneys to increase water reabsorption, reducing urine output and increasing blood volume.
4. Melatonin is the key hormone that regulates the body's circadian rhythm (sleep-wake cycle).

Answer:

1. d) E
2. a) Sleep aid
3. c) Antidiuretic hormone (ADH)
4. b) melatonin