Biology
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 labeled "1"?
(e) Name a soluble protein found in "4" which helps in clotting of blood.
Circulatory System
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Answer
(a) The parts indicated are as follows —
- 1 → Red Blood Cell (RBC)
- 2 → White Blood Cell (WBC)
- 3 → Blood Platelet
- 4 → Blood Plasma
(b) Two structural differences between red blood cells and white blood cells are:
| Red Blood Cells | White Blood Cells |
|---|---|
| Red blood cells are minute biconcave disc-like structures. | White blood cells are amoeboid and can produce pseudopodia with which they can squeeze through the walls of the capillaries into the tissues. |
| Red blood cells lack nucleus. | White blood cells have a nucleus. |
(c) The main functions of the parts labelled 1, 2 and 3 are as follows:
- Part 1 (Red Blood Cell) — Transport of respiratory gases to the tissues and from the tissues, transport of nutrients from the alimentary canal to the tissues.
- Part 2 (White Blood Cell) — WBCs play major role in defense mechanism and immunity of the body.
- Part 3 (Blood Platelet) — Blood platelets are the initiators of blood clotting.
(d) The average life span of a red blood cell (RBC) is about 120 days.
(e) Fibrinogen.
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Study the following diagram carefully and then answer the questions that follow:
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(b) Identify the phenomenon occurring in A.
(c) Mention two structural differences between 1 and 2.
(d) Name the process occurring in B and C and state the importance of this process in the human body.
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