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Veins have valves but arteries do not because: 1.pressure is needed for one-way blood flow in...

Veins have valves but arteries do not because:

1.pressure is needed for one-way blood flow in the veins

2.pressure works against gravity coming from atria of the heart

3.pressure from heart is enough for one-way blood flow

4.pressure from heart is enough for two-way blood flow

Science   Anatomy-And-Physiology   
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Answer #1

Answer : (1) pressure is needed for one-way blood flow in the veins

Rationale: In our body there are blood vessels to carry oxygenated and deoxygenated blood from the heart and to the heart.

Deoxygenated blood - veins

Oxygenated blood - Arteries

In that the veins from the body which has a function to send the blood from the body to the heart to oxygenises the blood. So veins have valve, which helps the blood goes to the heart without coming back or without flowing back.

so option A says that the pressure is needed for to send the blood from the body to the heart. But arteries no need pressure, because for to produce pressure, there is a organ called heart, which makes the blood to goes to the body and supply it.

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