HISTOLOGY
BLOOD VESSELS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Arteries
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veins
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Either A or B
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None of the above
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Detailed explanation-1: -Capillaries. Capillaries are tiny, extremely thin-walled vessels that act as a bridge between arteries (which carry blood away from the heart) and veins (which carry blood back to the heart).
Detailed explanation-2: -In arteries there is a lot more pressure, due to the force of blood being pumped outwards from the heart, so they need thicker walls in order to prevent bursting. In veins the pressure is much less, and so thinner walls are present.
Detailed explanation-3: -The walls of veins have the same three layers as the arteries. Although all the layers are present, there is less smooth muscle and connective tissue. This makes the walls of veins thinner than those of arteries, which is related to the fact that blood in the veins has less pressure than in the arteries.