Given below is a diagram of a smear of human blood. Study the same and answer the questions that follow:
a. Name the parts 1, 2, 3 and 4 indicated by guidelines.
b. Mention two structural differences between the parts labelled '1' and '2'.
c. What is the main function of the parts labelled 1, 2 and 3 respectively?
d. What is the life span of the part labelled '1'?
e. Name a soluble protein found in '4' which helps in the clotting of blood.

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Solution

a) 1) Red blood corpuscles, 2) White blood corpuscles, 3) Platelets, 4) Blood plasma.
b) RBCs lack nucleus whereas, WBCs have a nucleus. RBC has a biconcave shape while the shape of WBC is irregular.
c) Functions:-
1) RBCs- Its main function is to carry oxygen from the lungs to the body tissues and also carry carbon dioxide as a waste product away from tissues to lungs. Haemoglobin protein in RBCs helps in carrying oxygen.
2) WBCs- Its main function is to fight infection by preventing the entry of foreign particles.
3) Platelets:- Its main function is to prevent bleeding by clotting blood.
d) The life span of RBC is 120 days.
e) Fibrinogen is the soluble plasma protein that helps in blood clotting.

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