VASCULAR
CAPILLARIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which aspect of capillaries increases their surface area for exchange?
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There walls are made up of a single layer of cells
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They have a very small lumen
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There many of them and they are very small
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None of the above
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Explanation:
Detailed explanation-1: -They contain small pores, in addition to small gaps between cells, in their walls that allow for the exchange of larger molecules. This type of capillary is found in areas that require a lot of exchange between your blood and tissues.
Detailed explanation-2: -The windows, or openings, in fenestrated capillaries allow larger molecules to pass through them.
Detailed explanation-3: -Capillaries are thin-walled vessels composed of a single endothelial layer. Because of the thin walls of the capillary, the exchange of nutrients and metabolites occurs primarily via diffusion. The arteriolar lumen regulates the flow of blood through the capillaries.
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