Given below are four statements (a-d) regarding human blood circulatory system (i) A rteries are...

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Given below are four statements (a-d) regarding human blood circulatory system
(i) A rteries 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 A B can donate blood to any person with any blood group under \( A B O \) system.
(iv) Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?
(A) (i) \( \& \) (iv)
(B) (i) \( \& \) (ii)
(C) (ii) \& (iii)
(D) (iii) \& (iv)
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