Question

Given below are four statements (A-D) regarding the 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

• A. (A) and (D)
• B. (A) and (B)
• C. (B) and (C)
• D. (C) and (D)

Answer 1

Answer: (A)

(A) and (D)

Answer is option A i.e. "(A) and (D)"
Statement A and D are correct while rectified statements B and C are: Angina is acute chest pain when the blood circulation to the "heart" is reduced. As per ABO system, persons with blood group AB is universal acceptor and can "receive or accept" blood from other donors while people with blood group O are universal donors.
Thus, answer is option A.