During rest the breathing occurs rhythmically at the frequency of _________ times per minute in human?
Correct answer: B. 15-20
- A. 16-30
- B. 15-20
- C. 5?10
- D. 6?12
Explanation
A resting human normally breathes about 15 to 20 times per minute, with the rhythm controlled by respiratory centres in the brain in response to blood carbon dioxide levels. Students may choose 6 to 12 breaths per minute because that range can occur during unusually slow breathing, but it is below the usual resting range given here.
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About Human Respiratory System
The human respiratory system conducts air to the alveoli, where oxygen and carbon dioxide exchange occurs across thin respiratory surfaces. Questions cover the nasal passage, trachea, bronchi, lungs, diaphragm and intercostal muscles, ventilation mechanics and gas transport, while distinguishing breathing and gaseous exchange from cellular respiration.
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