What chemical is secreted by motor neurons at neuromuscular junctions in skeletal muscles?
A. Acetylcholine
B. Acetylcholinesterase
C. Sodium
D. Calcium
A. Acetylcholine
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The human testis contains many Leydig cells (interstitial cells) at various stages of differentiation, some of which have only half the normal number of chromosomes
Indicate whether the statement is true or false
What regulates the rate of water loss?
A) cardiovascular system B) kidney C) lungs D) skin E) digestive tract
Sympathetic stimulation of the heart causes the heart rate to
A. increase, then decrease. B. increase. C. decrease. D. stay the same.
In the process of depolarization of a neuron, the ________ flow of Na+ causes the ECF along the outside of plasma membrane to become ________ charged.
A. outward; positively B. inward; negatively C. inward; positively D. outward; negatively