Question

The walls of the capillaries and the alveoli are very thin. Why do they need to be thin?

Answer 1

Answer:

The capillary and alveolar walls are very thin because they allow rapid exchange of gases by passive diffusion along concentration gradients.

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Answer 2

The walls of the capillaries and the alveoli are very thin because they allow the rapid interchange of gases by passive diffusion with the concentration gradients.

• Capillaries possess extremely thin partitions. This characteristic facilitates nutrients and oxygen to ratify and diffuse from the blood into the tissues. This, therefore, facilitates waste commodities to diffuse out from tissues into the blood to be ratified to the lungs, eventually whirling oxygen-rich furthermore. In other words, thin borders of capillaries permit diffusion to happen through them. Therefore, diffusion is feasible as an outcome of the thinness of these borders, these are known as said endothelial cells.
• The borders of the alveoli are extremely thin. This permits oxygen and CO2 to pass effortlessly between the alveoli and capillaries, which are very tiny blood vessels. Oxygen can ratify from the alveoli to the capillaries because the concentration of oxygen is short in the capillaries than in the alveoli.

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