Outline how gaseous exchange occurs in the alveoli during submaximal exercise. (3 marks)
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Sample Answer
During submaximal exercise:
- Oxygen diffuses from high concentration in the alveoli to low concentration in the pulmonary capillaries.
- Simultaneously, carbon dioxide diffuses from high concentration in the blood to low concentration in the alveoli.
- This process is enhanced by the thin walls of both alveoli and capillaries, and the large surface area provided by millions of alveoli.
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Sample Answer
During submaximal exercise:
- Oxygen diffuses from high concentration in the alveoli to low concentration in the pulmonary capillaries.
- Simultaneously, carbon dioxide diffuses from high concentration in the blood to low concentration in the alveoli.
- This process is enhanced by the thin walls of both alveoli and capillaries, and the large surface area provided by millions of alveoli.