Given below are four statements (a-d) regarding human blood circulatory system:
(a) | Arteries are thick-walled and have narrow lumen as compared to veins. |
(b) | Angina is acute chest pain when the blood circulation to the brain is reduced. |
(c) | Persons with blood group AB can donate blood to any person with any blood group under the ABO system. |
(d) | Calcium ions play a very important role in blood clotting. |
Which two of the above statements are correct?
1. (a) and (b) | 2. (b) and (c) |
3. (c) and (d) | 4. (a) and (d) |
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Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?
1. Epinephrine | 2. Thrombokinase |
3. Thrombin | 4. Renin |
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All the following statements regarding coagulation of blood are correct except:
1. Prothrombinase catalyzes the breakdown of prothrombin to thrombin.
2. Thrombin catalyzes the conversion of fibrinogen to fibrin.
3. Antithrombin inactivates thrombin.
4. Heparin causes fibrinolysis.