Multiple choice

The part of the brain responsible for increasing breathing rate during exercise is the

  1. distal convoluted tubule

  2. corpus callosum

  3. hypothalamus

  4. medulla oblongata
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D Correct answer
Explanation

The medulla oblongata contains respiratory centers that control breathing rate and depth. During exercise, increased metabolic activity produces more CO2, which the medulla detects and responds to by increasing breathing rate to maintain gas exchange. The hypothalamus regulates homeostasis but not breathing, while the corpus callosum connects brain hemispheres and distal convoluted tubule is a kidney structure.

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