Question

Given below are 4 statements regarding human blood circulatory system.
(1) Arteries are thick-walled having narrow lumen as compared to veins.
(2) Calcium ions play a very important role in blood clotting.
(3) Persons with blood group AB can donate blood to any blood group under ABO system.
(4) Angina is acute chest pain, when the blood circulation to the brain is reduced.
Which two of the above statements are correct?

• A. 1 and 2
• B. 1 and 4
• C. 2 and 3
• D. 3 and 4

Answer 1

The correct option is A 1 and 2

The persons with blood group 'AB' are said to be 'universal recepient', because they can take blood from all the other blood groups under ABO system. This is because their blood serum or plasma does not contain any antibodies ('a' and 'b') therefore the antigens on the surface of RBCs of any donor, have no effect on their blood. But the persons with blood group 'AB' cannot donate blood to 'A', 'B' and 'O' blood group since, their RBCs carry both the surface antigens.
Angina is a term used for chest pain, caused by reduced blood flow to the heart muscle. Angina is a symptom of coronary artery disease. Angina is typically described as squeezing, pressure, heaviness, tightness or pain in chest. Angina, also called angina pectoris.