Question

A person with blood group A can donate blood to the persons with blood group A or AB because it
A. Has both A and B antigens
B. Has only A antigen and B antibodies
C. Has only B antigens and A antibodies
D. Does not have any antigens and antibodies

Answer 1

In a liquid called plasma, blood is composed of red blood cells, white blood cells and platelets. Your blood group is identified by antibodies and antigens in your blood.

Complete Answer:
Proteins discovered in plasma are antibodies. They're part of your body 's natural defences. They recognise foreign substances, such as germs, and alert and destroy the immune system.
Protein molecules located on the surface of red blood cells are antigens.

There are four major blood groups identified by the ABO system:
(I) Blood group A – has antigens in red blood cells and anti-B antibodies in the plasma
(II) Blood category B – produces B antigens with anti-A antibodies in the plasma
(III) Blood group O – has no antigens, but anti-A and anti-B antibodies in the plasma.
(IV) Blood group AB – has both A and B antigens, but there are no antibodies to it.

- Having blood from the wrong ABO party can be life threatening. For example, if an individual with group B blood is given group A blood, their anti-A antibodies will target group A cells.
- That's why group A blood must never be offered to someone who has group B blood and vice versa.
- As Group O red blood cells do not have any A or B antigens, they can be safely administered to any other group.
- As a result , a person with blood type A will donate blood to persons with blood type A and AB as both recipients of an antigen on their RBC surface and thus will not produce any antibodies when they receive blood.

The correct answer is option (B) Has only A antigens and B antibodies.

Note: Many people are eligible to donate blood, but only 1 in 25 people actually do so. You will donate blood if you donate:
1. They're fit and safe.
2. Weigh at least 50 kg (7th 12 lb).
3. They're 17-66 years old (or 70 if you've given blood before).
4. They are over 70 years old and have donated blood in the last 2 years.