Biology
Study the following diagram carefully and then answer the questions that follow:
(a) Name the cell labelled 1.
(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.
Circulatory System
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Answer
(a) The cell labelled 1 is a Red blood cell.
(b) Phenomenon occurring in A is Diapedesis.
(c) 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. |
(d) The process which occurs in B and C is phagocytosis. In this process, the WBCs engulf the foreign particles and destroy them, thus preventing the occurrence of disease.
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(c) Mention two structural differences between A and B.
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