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 ?

Options

A. (i) and (iv)
B. (i) and (ii)
C. (ii) and (iii)
D. (iii) and (iv)

Answer

A

Explanation

Angina is actute chest pain when the blood circulation to the heart is reduced. Person with blood group AB can receive blood from any person with any blood group under ABO system.