MEDICAL
RECTUM AND ANUS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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thick walls
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stiff
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thin walls
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rigid
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Detailed explanation-1: -And the fact that they are permeable means that it is much easier for the gases to diffuse from the capillaries into the cells and vice versa. We have therefore determined that the correct answer is (E). It is important for capillaries to have thin, permeable walls to allow substances to diffuse into and out of cells.
Detailed explanation-2: -The walls of capillaries are extremely thin. This property allows nutrients and oxygen to travel through the bloodstream and diffuse into the tissues. As a result, waste materials can diffuse out of tissues into the bloodstream and be carried to the lungs, where they can be re-oxygenated.
Detailed explanation-3: -Most capillaries are only about 8 to 10 micrometers in diameter (a micrometer is 0.001 mm). They’re so tiny that red blood cells have to pass through in a single file line. Capillaries contain two layers of cells: Endothelial cells are inside the capillary.