when the blood reaches cells it is with low pressure and after metabolic activities it is sent to heart through veins. To reach heart some pressure is required from where the pressure comes

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Solution

Blood return to the heart through veins. The pressure created by contraction of smooth muscles of the vein allows blood flow and veins also contain one-way valves which do not allow back flow of blood.

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Question 21
Choose the correct statement that describes arteries.

(a) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart.
(b) They have thin walls with valves inside, blood flows under low pressure and carries blood away from the heart to various organs of the body.
(c) They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body.
(d) They have thick elastic walls without valves inside, blood flows under high pressure and carries blood away from the heart to different parts of the body.

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

When your heart beats, it contracts and pushes blood through the arteries to the rest of your body. This force creates pressure on the arteries. This is called (i)___________.

The (ii)___ on the other hand, indicates the pressure in the arteries when the heart rests or relaxes between beats. A normal systolic blood pressure is (iii)___ and a normal diastolic blood pressure number is (Iv)_____.

Q. The pressure that develops in roots due to the metabolic activities of living cells is

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