All of the following occur during exercise except
A) vasodilation occurs to the active skeletal muscles.
B) venous return increases.
C) both cardiac output and stroke volume increase.
D) blood flow to the brain stays relatively constant.
E) blood flow to skin decreases.
Answer: E
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A. dentin. B. enamel. C. pulp. D. cementum. E. calcium phosphate.
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Indicate whether the statement is true or false
Why isn't an action potential transmitted from a postsynaptic membrane to a presynaptic terminal?
A. Presynaptic terminals have no acetylcholine receptors. B. Synaptic vesicles in the postsynaptic membrane are inactive. C. Acetylcholine is destroyed too quickly. D. Presynaptic neurons do not have a resting membrane potential. E. Acetylcholine can only diffuse in one direction across the synaptic cleft.