Question

Q1.Why are arteries thick walled and veins thin walled? Q2. Why do blood flows at high pressure inside the arteries and at low pressure inside the veins? Q3. How do blood helps in removing waste from our body?

Answer 1

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Ans 1 => Arteries are thicker than the veins as they have to bear extra pressure of the blood rather than the veins.

Ans 2 => Arteries are made up to transfer blood to the veins as fast as possible, increasing the pressure of flow as compared to the veins. Arteries have much more important job than that of veins of transferring oxygenated blood and expelling de oxygenated blood.

Ans 3 => Blood removes various toxins and kills bacteria in itself. WBC present in blood help to destroy various Poisoning substances hence, keeping our body purified.

Answer 2

Q1. Arteries are thick walled because they need much pressure to pump the blood throughout the body and thick walls provide that pressure.
Q2. The pressure in our arteries is more than in veins as the blood has to reach throughout our body.
Q3. Blood carries the waste in the body and this blood is the send to renal arteries in the kidney for purification and then comes out through renal veins. Then the waste in the kidney is sent out.

Hope it would help you out