What chemical is secreted by motor neurons at neuromuscular junctions in skeletal muscles?

A. Acetylcholine
B. Acetylcholinesterase
C. Sodium
D. Calcium


A. Acetylcholine

Anatomy & Physiology

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Sympathetic stimulation of the heart causes the heart rate to

A. increase, then decrease. B. increase. C. decrease. D. stay the same.

Anatomy & Physiology

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

Anatomy & Physiology

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

Anatomy & Physiology

What regulates the rate of water loss?

A) cardiovascular system B) kidney C) lungs D) skin E) digestive tract

Anatomy & Physiology