One of the primary reasons that one individual is faster in a 50-meter sprint than another is due to
a. a greater number of muscle fibers of smaller diameter.
b. more oxidative fibers in the lower limb muscles.
c. an enhanced ability to deliver oxygen to the muscles.
d. a greater percentage of fast-twitch fibers in the lower limb muscles.
d. a greater percentage of fast-twitch fibers in the lower limb muscles.
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Which of the following changes does not occur during exercise compared to rest?
A) Cardiac output is higher. B) Heart blood flow is higher. C) Skin blood flow is lower. D) Abdominal viscera blood flow is lower. E) Kidney blood flow is lower.
_________ macrophages engulf foreign particles that might be inhaled into the small sacs in the lungs
Fill in the blank(s) with correct word
Ganglionic neurons in the adrenal gland
A) are located in the adrenal cortex. B) release acetylcholine into blood capillaries. C) release epinephrine into blood capillaries. D) have no known function. E) are modified and can't release neurotransmitters.
The extra-embryonic membrane that forms blood cells is the
A) yolk sac. B) amnion. C) allantois. D) chorion.