Why does splashing cold water on the skin stimulate ventilation?
a. It decreases medullary inspiratory activity causing hyperpnea.
b. Hering-Breuer inflation reflex.
c. It increases medullary inspiratory activity causing hyperpnea.
d. J receptor.
ANS: C
Proprioceptors in muscles, tendons, and joints, as well as pain receptors in muscles and skin, send stimulatory signals to the medullary respiratory center. Such stimuli increase medullary inspirato-ry activity and cause hyperpnea. For this reason, moving the limbs, slapping or splashing cold water on the skin, and other painful stimuli stimulate ventilation in patients with respiratory de-pression.
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