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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(a) Identify the blood vessels A, B and C.
(b) Name the parts labeled 1-4.
(c) Mention two structural differences between A and B.
(d) Name the kinds of blood that flow through A and through B respectively.
(e) In which one of the vessels referred to in (a) above does the exchange of gases actually take place?
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(d) Name a similar kind of blood vessel which is related to the liver and kidney.
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(a) Label the parts 1 and 4 indicated in the diagram.
(b) Which of the above mentioned number is the thickest artery? Also write its name.
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(e) Draw neat and labelled diagrams of the transverse section of vena cava and the part numbered as 3. Make sure to show the structural differences between these two in the diagram.
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(b) Which part of the heart is contracting in this phase? Give a reason to support your answer.
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