Question

Given below are four statements regarding human blood circulatory system:-

1. Arteries are thick walled and have narrow lumen as compared to veins.
2. Angina is acute chest pain when the blood circulation to the brain is reduced.
3. Persons with blood group AB can donate blood to any person with any blood group under ABO system.
4. Calcium ions play a very important role in blood clotting.

Which two of the above statements are correct?

Options

• (i) and (iv)

• (i) and (ii)

• (ii) and (iii)

• (ii) and (iv)

Answer 1

(i) and (iv)

Explanation:

Angina is named after the chest pain caused by intense activity. The pain develops when the heart's demand surpasses the supply of coronary arteries.
Because people with the AB blood group carry both antigen A and B, their plasma will contain both anti-A and anti-B antibodies. Because of the presence of antibodies against antigens A and AB, a person cannot donate blood to anyone.
The person can, however, accept blood from any blood group. As a result, the AB blood group is a universal recipient.