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Question

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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