Question

What is the function of white blood cells?

• A. They have defensive function against infection.
• B. They mediate transport of oxygen from lungs to tissues.
• C. They help in the clotting of blood.
• D. They act as a source of energy.

Answer 1

The correct option is A

They have defensive function against infection.

The correct option is A.

Explanation for Correct Option:

1. White blood cells (WBCs) or corpuscles are known to defend the body against infection.
2. White blood cells make up one percent of the total blood cells and are known as leukocytes.

Explanation for Incorrect Options:

Option B:

1. Oxygen is transported from the lungs to tissue with the help of Red blood cells in which haemoglobin is present.

Option C:

1. Clotting of blood is mediated by platelets. They are also known as thrombocytes and are manufactured in the bone marrow.

Option D: The main source of energy in the human body is carbohydrates.

Final answer: White blood cells have a defensive function against infection.