The enzyme pepsin becomes active when pH is
A. high.
B. low.
B
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Cells that generate, conduct, and receive electrical messages are:
A) dendrites. B) neuroglial cells. C) neurons. D) soma.
B cells are responsible for
A. cell-mediated immunity. B. antibody-mediated immunity. C. inflammation. D. nonspecific immunity.
A muscle fiber is stimulated to contract when receptors on the ________ bind with acetylcholine released into the synaptic cleft by the terminal bouton of the ________.
A. synaptic vesicles; motor neuron B. motor neuron; sarcolemma C. sarcolemma; motor neuron D. sarcomere; motor neuron
The hypoblast layer of the blastodisc is made of
A. cuboidal cells and forms during the pre-embryonic period. B. cuboidal cells and forms during the fetal period. C. columnar cells and forms during the morula stage. D. columnar cells and forms during gastrulation.