Question

Choose true or false for each of the statements regarding gas exchange across the respiratory membranes.

1. The thinner the membranes, the more readily gas exchange occurs.   True  False
2. CO₂ has a diffusion coefficient of 20, and oxygen has a diffusion coefficient of 1; therefore CO₂ does not diffuse as readily through the
membranes as oxygen.  True  False
3. A larger surface area allows for more gas exchange.  True  False
4. Gas exchange occurs across membranes from areas of low concentration to high concentration True or False

Answer 1

1. GIVEN statement is TRUE.

Thinner membrane allows gas exchange more readily than thicker membrane.

Thickening of respiratory membrane is inversely proportional to gas exchange.

More thickness of membrane lesser will be the gas exchange.

2.Given statement is FALSE.

higher diffusion coefficient leads to higher rates of diffusion.

so as carbon dioxide has higher diffusion coefficient than oxygen so it diffuses readily than oxygen at respiratory membrane which has lower diffusion coefficient.

3.Given statement is TRUE.

large surface area allows more gas exchange. Decrease in surface areas will effect diffusion of respiratory gases.

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4.Given statement is FALSE.

Gas exchange takes place across membrane from areas of higher concentration to areas of lower concentration.

For example,oxygen diffuses from alveoli (region of high concentration) to blood vessels like arteries ( region of lower concentration). Carbon dioxide from veins ( region of high concentration) to alveoli ( region of lower concentration).

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