To which anatomic structures do the ventral respiratory centers send motor signals during inspira-tion? 1. Diaphragm 2. Larynx 3. Pharynx 4. Sternocleidomastoids
a. 1, 2, and 3 only
b. 2 and 4 only
c. 1 only
d. 1, 2, and 4
ANS: A
Some inspiratory VRG neurons send motor impulses through the vagus nerve to the laryngeal and pharyngeal muscles, abducting the vocal cords and increasing the diameter of the glottis. Other VRG inspiratory neurons transmit impulses to the diaphragm and external intercostal mus-cles.
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