Algonquin College Health Program Assessment (AC-HPAT) Practice Exam

What is the primary function of white blood cells?

1. Clotting blood

2. Transporting oxygen

3. Acting as part of the immune system

4. Carrying nutrients

The correct answer is: Acting as part of the immune system

The primary function of white blood cells is to act as a crucial component of the immune system. They play a vital role in identifying, attacking, and eliminating pathogens such as bacteria, viruses, and other foreign invaders that can cause disease. White blood cells are able to recognize these threats and also facilitate various immune responses, which include producing antibodies and coordinating the activities of other immune cells. This function is essential for maintaining health and combating infections. The immune response ensures that the body can remember past infections and respond more effectively if encountered again, a process known as immune memory. The other options focus on functions that do not pertain to white blood cells. Clotting blood is primarily the function of platelets and certain proteins in the blood. Transporting oxygen is the responsibility of red blood cells, which contain hemoglobin. Lastly, carrying nutrients is a function associated with plasma and various components in the blood but not directly related to white blood cells.