Valves are present at the opening of auricles into ventricles to prevent backflow of blood.
Question
Give reasons for the following statement Valves are present at the opening of auricles into ventricles.
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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 |