Multiple choice

When there is a decrease in the concentration of oxygen in the blood, the rate of breathing?

  1. Decreases

  2. increases

  3. Does not change

  4. first decreases, then increases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When oxygen concentration in blood decreases, the body detects this through chemoreceptors and responds by increasing breathing rate to bring in more oxygen. This is a homeostatic reflex to maintain adequate oxygenation. Options A and C are wrong because breathing doesn't decrease or stay constant. Option D describes a pattern not seen in this reflex.

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