Athletes who train for endurance rely more on cellular respiration than people who don't train. Their muscle fibers contain more
A. fatty acids.
B. water.
C. mitochondria.
D. lactic acid.
Answer: C
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The muscle that elevates the larynx is the ________ muscle
A) masseter B) buccinator C) platysma D) sternocleidomastoid E) stylohyoid
In the salamander, the sour taste receptor cells function by having an apically localized K+ channel that is blocked by protons. When protons are applied, what happens to the membrane potential and why?
A) Receptor depolarization because K+ permeability, which normally maintains a hyperpolarized resting state is reduced. B) Receptor hyperpolarization because H+ ions move into the cell and render it more positively charged. C) Receptor hyperpolarization because the H+ ions outside the cell make the inside of the cell more negatively charged. D) Nothing will happen until the G-protein is activated.
The release of estrogen affects the endometrium by
When innate immunity is activated,
A. each exposure is very specific. B. previous exposures are remembered. C. each exposure produces the same response. D. each exposure increases the strength of the immune response. E. the second exposure does not produce a response.