Q. No.Platelets are cell fragments that:
| I: | are produced from megakaryocytes in the spleen in fetal life |
| II: | can release variety of factors involved in blood coagulation |
1. Only I is correct
2. Only II is correct
3. Both I and II are correct
4. Both I and II are incorrect
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Identify the incorrectly matched pair:
| 1. | Plasma protein | – | 6 to 8 % |
| 2. | Formed elements | – | 55% of the blood |
| 3. | Hemoglobin | – | 12 to 16 gm in 100 ml of blood |
| 4. | Platelets | – | 150000 to 350000 mm-3 |
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Which of the following would not be normal in a healthy human being?
1. A cells/blood ratio of 45%
2. A plasma albumin concentration of 4%
3. An RBC count of 5.2 million mm-3
4. A hemoglobin level of 15 gram per liter
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A. The number of I is increased in worm infestations and II secretes histamine and heparin in the blood.
B. III plays a vital role in acquired immunity.
C. The number of IV is significantly reduced in acute bacterial infections.
| 1. Only B | 2. Only A and B |
| 3. Only C | 4. A, B and C |
Match the plasma proteins in Column I with their function in Column II and select the correct answer from the codes given:
| Column I | Column II | ||
| A. | Albumins | a. | Hemostasis |
| B. | Globulins | b. | Transport carriers and immunity |
| C. | Fibrinogen | c. | Colloid osmotic pressure |
Codes
| A | B | C | |
| 1. | a | b | c |
| 2. | a | c | b |
| 3. | b | a | c |
| 4. | c | b | a |
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To activate coagulation at the site of injury, certain factors that play an important role in coagulation, can be released by:
| 1. | Platelets and damaged tissue |
| 2. | Basophils and mast cells |
| 3. | Wall of the damaged vessel and basophils |
| 4. | Platelets and mast cells |
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The second most common formed elements in the human blood are:
| 1. | Proteins | 2. | Water |
| 3. | RBC | 4. | Thrombocytes |
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RBCs are the most common cells in human body and have a shape of a biconcave disc that:
1. decreases the distance between the cell membrane and hemoglobin molecules, facilitating oxygen uptake
2. allows the cells to hold more hemoglobin for a given volume
3. allows them to squeeze through the tight spaces in the spleen
4. keeps them from leaking out through the walls of capillaries
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The average life span of human red blood cells is:
| 1. | 10 days | 2. | 120 days |
| 3. | 21 days | 4. | three months |
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