STANDARD Zoology Blood Circulatory System Multiple Correct Question
Given below are four statements (i-iv) regarding human blood circulatory system. (i) Arteries are thick-walled and have narrow lumen as compared to veins. (ii) Angina is acute chest pain when the blood circulation to the brain is reduced. (iii) Persons with blood group AB can donate blood to any person with any blood group under ABO system. (iv) Calcium ions play a very important role in blood clotting. Which two of the above statements are correct?
(i) and (iv)
(i) and (ii)
(ii) and (iii)
(iii) and (iv)
Correct Answer
Detailed Explanation
The term angina means chest pain. In this disease, enough oxygen does not reach the heart muscles. The patient experiences heart pain usually in front of the chest. AB blood group persons have both antigens A and B, but do not have antibodies in the plasma. Due to the presence of both the antigens, AB blood group persons cannot donate blood to anyone. However, the person can receive blood from any blood group as it has no antibodies. Thus, AB blood group is a universal recipient.
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