Question

White blood cells act :

• A. as a defence against infection
• B. as source of energy
• C. for clotting blood
• D. as a medium for oxygen transport from lungs to tissues

Answer 1

Answer:

A. as a defence against infection

White blood cells are a part of your immune system that protects your body from infection. These cells circulate through your bloodstream and tissues to respond to injury or illness by attacking any unknown organisms that enter your body.