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Q. No.Why do higher animals like mammals and birds possess a closed circulatory system instead of an open one?
1.
Because it allows blood to come in direct contact with tissues for faster absorption of oxygen
2.
Because closed circulation prevents blood from reaching vital organs
3.
Because open circulation is too complex for warm-blooded animals
4.
Because a closed system permits more efficient nutrient and gas exchange through capillaries under controlled pressure
Subtopic: Circulatory Pathways |
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Regarding Lymph:
| A: | It is a colourless fluid containing specialised lymphocytes which are responsible for the immune responses of the body. |
| B: | It is an important carrier for nutrients, hormones, etc. |
| C: | Fats are absorbed through it in the lacteals present in the intestinal villi. |
| 1. | Only A is correct |
| 2. | Only B and C are correct |
| 3. | Only C is correct |
| 4. | A, B and C are correct |
Subtopic: Lymph |
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Identify the incorrect statement regarding the human heart:
| 1. | It is mesodermally derived organ. |
| 2. | It is situated in the thoracic cavity, in between the two lungs, slightly tilted to the left. |
| 3. | It has the size of a clenched fist. |
| 4. | It is protected by a double walled membranous bag, the pleura. |
Subtopic: Human Heart: Gross Anatomy |
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Which of the following WBCs is correctly matched with its percentage in blood?
1. Neutrophils - 20-25%
2. Eosinophils - 6-8%
3. Basophils - 0.5-1%
4. Monocytes - 10-12%
1. Neutrophils - 20-25%
2. Eosinophils - 6-8%
3. Basophils - 0.5-1%
4. Monocytes - 10-12%
Subtopic: Blood: White Blood Cells |
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Which of these is NOT a component of the lymphatic system?
1. Tissue fluid
2. Lymphocytes
3. Erythrocytes
4. Lymph vessels
1. Tissue fluid
2. Lymphocytes
3. Erythrocytes
4. Lymph vessels
Subtopic: Lymph |
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Which of the following statements is correct about formed elements in blood?
1. RBCs have a lifespan of 90 days
2. Neutrophils constitute 20-25% of total WBCs
3. Platelets are produced from megakaryocytes
4. Eosinophils are the most abundant WBCs
1. RBCs have a lifespan of 90 days
2. Neutrophils constitute 20-25% of total WBCs
3. Platelets are produced from megakaryocytes
4. Eosinophils are the most abundant WBCs
Subtopic: Blood: General Description & RBC |
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Subtopic: Blood: General Description & RBC |
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The normal platelet count in human blood is:
1. 150,000-350,000/mm³
2. 350,000-550,000/mm³
3. 550,000-750,000/mm³
4. 750,000-950,000/mm³
1. 150,000-350,000/mm³
2. 350,000-550,000/mm³
3. 550,000-750,000/mm³
4. 750,000-950,000/mm³
Subtopic: Blood: General Description & RBC |
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Which cells provide immunity through antibody production?
1. Neutrophils
2. Monocytes
3. Lymphocytes
4. Eosinophils
1. Neutrophils
2. Monocytes
3. Lymphocytes
4. Eosinophils
Subtopic: Blood: White Blood Cells |
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Which ion plays a crucial role in blood clotting?
1. Sodium
2. Potassium
3. Calcium
4. Magnesium
1. Sodium
2. Potassium
3. Calcium
4. Magnesium
Subtopic: Blood: Blood Clotting |
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