What is the main function of the immune system?

What is the main function of the immune system?

• A. Regulating metabolism
• B. Protecting the body from disease
• C. Managing hormonal balance
• D. Filtering toxins from the blood

Answer: (B)

The main function of the immune system is to protect the body from disease. This system consists of a network of cells, tissues, and organs that work together to identify and eliminate pathogens, such as bacteria, viruses, fungi, and parasites, that can cause illness. The immune response involves various components, including white blood cells, antibodies, and other substances that help recognize and neutralize harmful invaders.

In contrast, regulating metabolism pertains to the body's process of converting food into energy and managing bodily functions through chemical reactions, which falls under the role of the endocrine system. Managing hormonal balance involves the production and regulation of hormones by glands, which is vital for maintaining homeostasis and does not directly relate to the immune response. Filtering toxins from the blood is primarily the function of the liver and kidneys, which work to remove waste products and harmful substances from the body, rather than the immune system itself. Overall, the role of the immune system is central to maintaining health by defending against infections and disease.