All oxygenated blood returns to the heart via the:
A. pulmonary artery.
B. pulmonary veins.
C. aorta.
D. venae cavae.
Answer: B. pulmonary veins.
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Neurotransmitters:
a. are released by the postsynaptic neuron b. are distributed randomly throughout the nervous system c. can diffuse back into the synaptic knob d. all of the above
Taste buds are not found ________
A) in circumvallate papillae B) in filiform papillae C) lining the buccal cavity D) in fungiform papillae
Contact digestion takes place in/at the ________.
A. cytoplasm in the cells of the small intestine B. brush border of the small intestine C. gastric pits D. intestinal crypts E. surface of the gastric mucosa
On the surface of the sarcolemma, the membrane potential may depolarize and repolarize rapidly. This change in electrical potential caused by membrane permeability changes for ions is known as a(n)
A) action potential. B) myosin potential. C) energy of dissipation. D) resting membrane potential.