VASCULAR
CAPILLARIES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They carry blood away from the heart
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They are a site for exchange of substances from the blood to the cells, and vice versa
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The carry blood to the heart
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None of the above
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Detailed explanation-1: -The site of exchange of materials between blood and the surrounding cells is capillaries. Blood capillaries are the smallest vessels and are only one cell thick. Hence, exchange of materials can easily occur by diffusion across the membranes of blood capillaries.
Detailed explanation-2: -Capillaries, the smallest and most numerous of the blood vessels, form the connection between the vessels that carry blood away from the heart (arteries) and the vessels that return blood to the heart (veins). The primary function of capillaries is the exchange of materials between the blood and tissue cells.
Detailed explanation-3: -Capillaries are so small that blood cells can only move through them one at a time. Oxygen and food nutrients pass from these capillaries to the cells. Capillaries are also connected to veins, so wastes from the cells can be transferred to the blood.
Detailed explanation-4: -Final answer: Exchange of various materials between the blood and body cells takes place by capillaries.