Adjustment of respiratory muscle contractions to accommodate varying loads is regulated by which of the following?
a. Medullary respiratory centers
b. Muscle spindle fiber feedback
c. Pontine apneustic center
d. Pontine pneumotaxic center
ANS: B
Muscle spindles in the diaphragm and intercostal muscles are part of a reflex arc that helps the muscles adjust to an increased load.
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