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Biology · Oct / Nov 2019 · Paper 11 · Question 17

5090Human gas exchange

What happens during expiration?

  1. Adiaphragm muscles: contract; pressure in thoracic cavity: falls and then rises; volume of thoracic cavity: decreases
  2. Bdiaphragm muscles: relax; pressure in thoracic cavity: rises and then falls; volume of thoracic cavity: decreases
  3. Cdiaphragm muscles: contract; pressure in thoracic cavity: rises and then falls; volume of thoracic cavity: increases
  4. Ddiaphragm muscles: relax; pressure in thoracic cavity: falls and then rises; volume of thoracic cavity: increases

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Correct answer: B. diaphragm muscles: relax; pressure in thoracic cavity: rises and then falls; volume of thoracic cavity: decreases

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