Question 5

White blood cells are responsible for fighting infection.

White blood cells play a crucial role in the immune system by identifying and combating pathogens such as bacteria, viruses, and other foreign invaders, thus protecting the body from infections.

A) delivering oxygen to the bodies cells

This option describes the function of red blood cells, not white blood cells. Red blood cells are responsible for transporting oxygen from the lungs to the tissues and facilitating carbon dioxide removal. Therefore, this choice is incorrect.

B) the clotting of the blood

Blood clotting is primarily the function of platelets and certain proteins in plasma, not white blood cells. While white blood cells can play a role in inflammation and healing, they do not directly contribute to the clotting process. Thus, this option is also incorrect.

C) fighting infection

This option accurately describes the primary role of white blood cells. They are integral to the immune response, actively seeking out and destroying pathogens, which makes this the correct answer.

D) making synovial fluid

Synovial fluid is produced by synovial membranes and serves to lubricate joints, but it is not a function associated with white blood cells. White blood cells do not play a role in the synthesis of synovial fluid, rendering this option incorrect.

Conclusion

The correct answer, C, emphasizes the essential role of white blood cells in the immune system, distinguishing them from other blood components that perform entirely different functions. Options A, B, and D clearly misattribute functions to white blood cells that belong to other cell types or biological processes, highlighting the importance of understanding the specific roles of different blood cells in maintaining health.