What is the primary role of the immune system?

What is the primary role of the immune system?

• A. To facilitate nutrient absorption
• B. To defend the body against pathogens and diseases
• C. To transport oxygen in the blood
• D. To regulate body temperature

Answer: (B)

The primary role of the immune system is to defend the body against pathogens and diseases. This complex network of cells, tissues, and organs works together to identify and neutralize harmful invaders such as bacteria, viruses, fungi, and parasites. The immune system employs various mechanisms, including the production of antibodies, activation of white blood cells, and the release of signaling molecules called cytokines, to protect the body from infection and maintain overall health. In contrast, the other functions mentioned in the options do not pertain to the immune system. Facilitating nutrient absorption is primarily a function of the digestive system. Transporting oxygen in the blood is the role of the circulatory system, specifically through red blood cells. Regulating body temperature is mainly managed by the integumentary system and the hypothalamus in the brain. Thus, these options emphasize vital bodily functions that are separate from the fundamental mission of the immune system.

The primary role of the immune system is to defend the body against pathogens and diseases. This complex network of cells, tissues, and organs works together to identify and neutralize harmful invaders such as bacteria, viruses, fungi, and parasites. The immune system employs various mechanisms, including the production of antibodies, activation of white blood cells, and the release of signaling molecules called cytokines, to protect the body from infection and maintain overall health.

In contrast, the other functions mentioned in the options do not pertain to the immune system. Facilitating nutrient absorption is primarily a function of the digestive system. Transporting oxygen in the blood is the role of the circulatory system, specifically through red blood cells. Regulating body temperature is mainly managed by the integumentary system and the hypothalamus in the brain. Thus, these options emphasize vital bodily functions that are separate from the fundamental mission of the immune system.