The cytoplasmic extensions that, together with the cell body, provide the main receptive surfaces for neurons are
A. dendrites.
B. chromatophilic substance (Nissl bodies).
C. axons.
D. neurofibrils.
Answer: A
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What is the structural classification of the neuron labeled A?
a) bipolar neuron b) multipolar neuron c) unipolar neuron d) nonpolar neuron e) pseudounipolar
Under which set of circumstances would the diameter of peripheral blood vessels be the greatest?
A) decreased parasympathetic stimulation B) increased sympathetic stimulation C) both increased parasympathetic and increased sympathetic stimulation D) decreased sympathetic stimulation E) increased parasympathetic stimulation
What is the function of the transverse tubules in a skeletal-muscle fiber?
A. They store the calcium ions that are the main source of activation for the cross-bridge cycle. B. They form the Z lines that mark the end of each sarcomere. C. They allow action potentials to propagate deep into the center of skeletal muscle cells. D. They manufacture and store ATP. E. They run in parallel with the myofibrils, and have abundant Ca2+-ATPase proteins for pumping Ca2+ back into the sarcoplasmic reticulum.
The fingerlike structures of the placenta that form from its fetal portion are known as
A. chorionic villi. B. amniotic villi. C. amniotic stalks. D. chorionic stalks.