Arteries have thick walls as they carry oxygenated blood with high pressure from the heart to all body parts. Veins on the other hand have thin walls and carry deoxygenated blood from the body towards the heart. From this we conclude-
The more the blood pressure, the _______ the walls of blood vessels. [1 Mark]

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Solution

Blood vessels circulate blood throughout your body. They help deliver oxygen to vital organs and tissues, and also remove waste products. Blood vessels include veins, arteries and capillaries. Thicker blood vessels can sustain the high blood pressure. [0.5 Marks]
So, the answer is :
The more the blood pressure, the thicker the walls of blood vessels. [0.5 Marks]

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Similar questions

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.

___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___ (b)___ carry carbon dioxide-rich blood from all parts of the body back to the heart. ___ (c)___ have thin walls and __ (d)___ have thick elastic walls. Blood flows at high pressure in ___ (e)____. Valves are present in __ (f) ___ which allow blood to flow only towards the heart. __ (g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form ____ (h)_____.

Q. Statement 1: Arteries carry blood to the heart from various body parts.
Statement 2: Arteries have thick and elastic walls.

Q. Select the incorrect statements.
A. Arteries have thick elastic walls and veins have valves.
B. Capillaries are the smallest blood vessels supplying the tissues.
C. AV node is known as the pace setter of the heart.
D. Arteries carry blood towards the heart and veins carry blood away from the heart to different organs.

The biology teacher was teaching the students about a blood vessel which was bringing blood to the heart from the body, it carries carrying deoxygenated blood and is thin walled. She also mentioned that blood flows under low pressure. Which vessel would it possibly be?

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