Veins have valves to prevent the backflow of blood because the blood in veins flow -at a low pressure-at nbsp-atmospheric pressure-at a high pressure-at a neutral nbsp-pressure-

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Byju's Answer

Standard VII

Biology

Blood Vessels

Veins have va...

Question

Veins have valves to prevent the backflow of blood because the blood in veins flow ________.

at a low pressure

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at a high pressure

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at a neutral pressure

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at atmospheric pressure

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Solution

The correct option is A
at a low pressure

Veins are blood vessels which bring blood from the body back to the heart. They are larger and hold more blood than the arteries. The blood passing through the veins is deoxygenated (except in pulmonary veins) and flows at a low pressure. It flows slow and steady against the direction of gravity. Therefore, veins have valves to prevent the backflow of blood.

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Similar questions

Veins have valves to prevent the backflow of blood because the blood in veins flow ________.

Q. Why doesn't the arteries need valves?
1. Is it because of high pressure . CAN HIGH PRESSURE MAKE THE CELLS MOVE IN FORWARD DIRECTION?
2. So that means that because the cells in the veins dont have much pressure they need valves..

3. But this goes against..this..
" Varicose veins occur when veins are unable to prevent backward flow of blood in places where high blood pressure occurs such as in the feet"

Plz explain while considering my guess.

Thankyou

Q. State the true statements of the following:

(1)

Blood flowing in arteries is without high pressure.

(2)

Blood flowing in veins is without high pressure.

(3)

Veins have valves opening towards heart.

(4)

Arteries have valves opening towards heart.

Q. have valves to prevent backflow of blood moving under low pressure.

Question 06
Low concentration of oxygen in the blood and tissues of people living at high altitude is due to..............
(a) low temperature
(b) low atmospheric pressure
(c) high atmospheric pressure
(d) Both low temperature and high atmospheric pressure

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