Blood flow in arteries is rapid and at a high pressure. Also arteries have thick elastic walls.
Question
Veins have valves which allow blood to flow only in one direction. Arteries do not have valves. Yet the blood flows in one direction only. Can you explain why?
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While learning to ride a bicycle Boojho lost his balance and fell. He got bruises on his knees and it started bleeding. However, the bleeding stopped after some time. a. Why did the bleeding stop? b. What would be the colour of the wounded area and why? c. Which type of blood cells are responsible for clotting of blood?
Open Answer »Read the following terms given below.
| root hairs | Xylem | Urethra |
| arteries | Kidneys | Veins |
| atria | Capillaries | Heart |
| ureter | Phloem | Urinary bladder |