The C shape of the tracheal cartilages is important because
A) large masses of food can move through the esophagus.
B) large masses of air can pass through the trachea and thus the bronchi.
C) it facilitates turning of the head.
D) the bronchi are also C-shaped.
E) it permits the trachea to pinch shut prior to sneezing.
Question 2
In general, autonomic tone of peripheral blood vessels increases when
A) sympathetic stimulation is increased.
B) sympathetic stimulation is decreased.
C) parasympathetic stimulation is increased.
D) parasympathetic stimulation is decreased.
E) somatomotor stimulation is increased.