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
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 |
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
| 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 |
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 |
The second most common formed elements in the human blood are:
| 1. | Proteins | 2. | Water |
| 3. | RBC | 4. | Thrombocytes |
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
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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