The nurse is reviewing with a group of clients about the regulators of breathing and how they function. What is the best explanation by the nurse to the clients about the role of the medulla in the regulation of respirations?
A) Works to produce a normal breathing rhythm
B) Allows some voluntary control over breathing
C) Stimulates the muscles of respiration
D) Involuntary control of the depth and rate of respirations
D
Feedback:
The medulla's respiratory center automatically controls the depth and rate of respirations without requiring a person's conscious thought. The pons has centers that work with the medulla to produce a normal breathing rhythm. The cerebral cortex allows some voluntary control over breathing when talking, singing, eating, or changing the rate of breathing. You can even stop breathing for a minute or two by holding your breath. The medulla, however, will take over control eventually. Chemoreceptors in the medulla stimulate the muscles of respiration primarily in response to changes in carbon dioxide levels.
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