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Multiple Choice



1

The two major systems involved in the control of homeostatic bodily functions are
A)endocrine and nervous systems.
B)endocrine and cardiovascular systems.
C)endocrine and renal systems.
D)endocrine and metabolic systems.
2

The effect a hormone exerts on a tissue is directly related to
A)the chemical structure of the hormone.
B)the concentration of the hormone in the plasma.
C)the number of receptors available.
D)both b and c.
3

The magnitude of the effect a hormone has is directly related to
A)the plasma volume.
B)the rate of hormone secretion.
C)plasma hormone concentration.
D)all of the above.
4

If a hormone-receptor interaction activates a Ca++ ion channel and Ca++ enters the cell, it will often bind to
A)phosphodiesterase.
B)calmodulin.
C)cyclic AMP.
D)5'AMP.
5

Examples of second messengers in the events following a hormones binding to a receptor are
A)cyclic GAMP and caffeine.
B)epinephrine and inositol triphosphate.
C)diacyclglycerol and phospholipase C.
D)cyclic AMP and Ca++-calmodulin.
6

When G protein activates adenylate cyclase, what molecule is formed from ATP?
A)phosphodiesterase
B)cyclic AMP
C)calmodulin
D)calcium
7

Hormones released from the anterior pituitary include
A)growth hormone and anti diuretic hormone.
B)thyroid stimulating hormone and thyroxine.
C)prolactin and adrenocorticotropic hormone
D)luteinizing hormone and somatomedins.
8

Catecholamines are secreted from
A)the adrenal cortex.
B)the adrenal medulla.
C)the parathyroid gland.
D)none of the above.
9

Aldosterone is secreted by
A)the adrenal cortex.
B)the adrenal medulla.
C)the parathyroid gland.
D)none of the above.
10

At what approximate exercise intensity do increases in blood levels of aldosterone, renin and angiotensin II occur?
A)20%
B)30%
C)50%
11

High blood levels of glucocorticoids can result in
A)muscle atrophy.
B)muscle hyperplasia.
C)muscle hypertrophy.
D)muscle hypoplasia.
12

The initial event at the onset of exercise activating phosphorylase activity is
A)increased intracellular cAMP.
B)increased intracellular calcium.
C)increased release of epinephrine.
D)none of the above.
13

Chronic exercise training testosterone levels in males.
A)increases
B)decreases
C)decreases then increases
D)does not effect
14

The maintenance of plasma glucose during exercise can be accomplished by
A)liver glycogenolysis.
B)mobilization of FFA.
C)liver gluconeogenesis.
D)all of the above.
15

Examples of slow-acting hormones responsible for the maintenance of plasma glucose are
A)epinephrine and norepinephrine.
B)insulin and glucagon.
C)cortisol and growth hormone.
D)none of the above.
16

The increased uptake of glucose when insulin decreases is due to
A)decreasing intracellular calcium.
B)increased membrane permeability.
C)increased number of glucose transporters.
D)decreasing catecholamines.
17

Epinephrine acts to maintain blood glucose by binding to
A)alpha receptors on the liver.
B)alpha cells of the pancreas.
C)beta receptors on the liver.
D)beta cells of the pancreas.
18

An effect of endurance training that results in sparing carbohydrate stores is
A)decreasing epinephrine concentration.
B)decreasing lactate concentration.
C)decreasing insulin concentration.
D)decreasing glucagon concentration.





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