Which of the following changes in banding pattern occur during muscle relaxation?
a. Thin filaments move away from the Z lines.
b. I bands get wider.
c. H zones get narrower.
d. Thick filaments become longer.
e. Both b and c occur.
B
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The adrenal medulla develops from which of the following germ layers during embryonic development?
a) Mesoderm b) Endoderm c) Ectoderm d) A combination of two of the layers e) None of the answer selections are correct
In the heart, valves are located
A) between atria and ventricles and between ventricles and arteries. B) just between the great veins and the atria. C) just between the atria and the ventricles. D) just between the ventricles and the arteries. E) just between the right and left ventricles.
On what three structures can a neuron terminate?
a. spinal cord, peripheral nerve, or organ b. smooth muscle, striated muscle, or cardiac muscle c. gland, other neuron, or blood vessel d. peripheral nerve, spinal nerve, or brain neuron e. muscle, gland, or other neuron
The upper respiratory tract consists of the ________.
A. nose, pharynx, and larynx B. nose and pharynx C. nose and oral cavity D. nose, pharynx, larynx, and part of the trachea