What is incorrect about a vein?

A vein has a thinner wall compared to an artery

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Blood flows at zero pressure through a vein

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Blood tends to flow backwards through a vein

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There are valves in a vein

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Solution

The correct option is B Blood flows at zero pressure through a vein
Blood flows at a lower pressure than an artery through a vein, but the pressure is not zero. It has an average value of 80 mm Hg. However, since the pressure is lower than that in an artery, blood sometimes tends to flow backwards in a vein. To prevent this backward flow, a vein has valves. A vein has a thinner wall than an artery because of the lower pressure of blood in it.

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Similar questions

Q. In veins, valves are present to check backward flow of blood flowing at:

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

Valves are found in veins to check the backflow of blood flowing under

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. 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

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