The body's main energy storage molecules are
A. sugars.
B. proteins.
C. lipids.
D. vitamins.
E. carbohydrates.
C
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When a skeletal muscle fiber contracts, the
A) H bands and I bands get larger. B) zones of overlap get larger. C) Z lines move further apart. D) width of the A band increases. E) All of the answers are correct.
The half-life of a hormone is
A. one-half of the time it takes to synthesize the chemical messenger molecule. B. the time necessary to reduce the hormone concentration in the blood to half of what had been secreted. C. half the time until the hormone molecule dissolves. D. half of the duration of the hormone's effects on its target cells throughout the body.
If the body experiences a drop in volume or blood pressure:
A) aldosterone stimulates the sweat glands, resulting in diaphoretic skin. B) adrenocorticotropic hormone causes a reduction in the secretion of cortisol. C) aldosterone secretion stimulates the kidneys to reabsorb sodium from the urine. D) catecholamine release inhibits the conversion of glycogen to glucose in the liver.
Which of the following describes the duplicity theory of vision?
A. Light adaptation and dark adaptation are adjustments in vision to changing light intensities. B. There are short-wavelength cones and long-wavelength cones. C. A single type of receptor system cannot produce both high sensitivity and high resolution. D. Cones and rods are responsible for both photopic (day) vision as well as trichromatic (color) vision. E. Cones are responsible for both photopic (day) vision as well as trichromatic (color) vision.