Control of the diameter of the respiratory passages depends upon
A) sympathetic stimulation only.
B) parasympathetic stimulation only.
C) somatomotor stimulation only.
D) both parasympathetic and sympathetic levels of stimulation.
E) sensory receptors sensitive to changes in lung ventilation.
Answer: D
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a. efferent b. afferent c. interneurons d. cranial
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