Question

Name the constituents of blood. Why are white blood corpuscles called 'soldiers of the body'?
OR
Draw a diagram of human heart and label the following on it:
(i) Aorta
(ii) Pulmonary trunk
(iii) Superior vena cava
(iv) Coronary arteries

Answer 1

The constituents of blood are RBCs, WBCs, platelets and plasma. WBCs are so called as they fight against foreign bodies in the blood and protect the body and thus they are agents of defence mechanism of our body .

Answer 2

White blood corposules called soldiers of body because they can fight with the disease and the germ present in our body carried by blood and help to maintain our body healthy.