Question

A person with which one of the following blood group is considered a universal donor?
1. O
2. A
3. AB
4. B

Answer 1

Correct Answer - Option 1 : O

The correct answer is O.

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• Blood Group O is called the Universal Donor because it does not contain any antigen.
• Blood Group AB is called Universal Receptor because it does not contain any antibody.
• Rh factor also called the Rhesus factor, is a type of protein found on the outside of red blood cells. If it is found in the blood of people, their blood is said to be Rh-positive and if in the blood of people it is not found, their blood is said to be Rh-negative.
• Human Blood:
  • The quantity of blood in the human’s body is 7% of the total weight.
  • Blood is fluid connective tissue and composed of blood corpuscles, plasma, and platelets.
  • It is slightly alkaline in nature (pH 7.4).
  • Its volume in an adult is 5.8 L.
  • People who live at high altitudes have more blood than those who live in low regions.
  • This extra blood supplies additional oxygen to body cells.
  • During blood clotting, fibrinogen changes into fibrin by thrombin which is obtained from thromboplastin in the presence of Ca⁺².
  • Female contains half a liter of bloodlessness in comparison to male.

• Blood Transfusion: Antigen ‘A’ and antibody ‘A’, Antigen ‘B’ and antibody ‘B’ cannot live together.
  • In case so happened, these get most sticky, such spoils the blood. This is called agglutination of blood. 
• At the time of blood transfusion, Rh-factor is also tested. Rh-positive is given to Rh-positive blood and Rh-negative is given to Rh-negative blood only.