Blood flows rather rapidly as it leaves the human heart. Upon arriving at the capillaries, it slows dramatically. This reduction in speed is largely due to:

The increase in pressure as the blood gets farther away from the heart

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Changes in pressure that result from water evaporation on the skin

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The resistance offered by the small diameter of the capillaries

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Differences in pressure caused by the sugar content of the bloods.

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Solution

The correct option is C The resistance offered by the small diameter of the capillaries
The small diameter of capillaries offers great resistance to blood flow. This slows the blood to a speed at which nutrient and gas exchange with neighbouring cells is more efficient.

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Blood flows rather rapidly as it leaves the human heart. Upon arriving at the capillaries, it slows dramatically. This reduction in speed is largely due to:

The correct option is C The resistance offered by the small diameter of the capillariesThe small diameter of capillaries offers great resistance to blood flow. This slows the blood to a speed at which nutrient and gas exchange with neighbouring cells is more efficient.

The correct option is C The resistance offered by the small diameter of the capillaries
The small diameter of capillaries offers great resistance to blood flow. This slows the blood to a speed at which nutrient and gas exchange with neighbouring cells is more efficient.