Anatomy Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of the immune system is to defend against pathogens and disease. This intricate network of cells, tissues, and organs works collaboratively to identify and eliminate various foreign invaders, including bacteria, viruses, fungi, and parasites. The immune system utilizes various mechanisms, such as the production of antibodies and the activation of immune cells, to recognize and neutralize threats.

By employing both innate and adaptive immunity, the system can respond rapidly to immediate threats and create long-lasting memory responses to ensure a quicker reaction to previously encountered pathogens. This protective role is crucial for maintaining overall health and preventing infections or diseases from taking hold in the body.

In comparison, circulating blood is a function primarily associated with the cardiovascular system, which is responsible for transporting oxygen and nutrients, while providing energy is a metabolic function primarily linked to processes such as respiration and digestion. The immune system does not play a role in facilitating digestion either, as that function is largely managed by the digestive system. Understanding the immune system's vital role highlights its importance in health and disease prevention.