The rate of breathing is regulated by

A ) Amount of oxygen in the blood

B ) Amount of carbon dioxide in blood ✅

C ) Amount of oxygen in the cells

D ) Amount of carbon dioxide in the cells

Related Questions
  1. If a colour-blind lady marries a normal male,and gives birth to a son and a daughter,then
  2. One of the followings is not a characteristic of an insect.
  3. One mole of haemoglobin containing blood carries how many oxygen.
  4. Which act as harmone.
  5. Which of the following is sedative?
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