Question

how does fever indicate that your bodys immune system is doing its job?
fever increases red blood cell production.
fever raises the bodys temperature to destroy harmful substances.
fever triggers inflammation.
fever causes the secretion of hormones that fight harmful substances.

Explanation:

To determine the correct answer, we analyze each option:

• "Fever increases red blood cell production": Red blood cells are mainly for oxygen transport, and fever doesn't increase their production for immune purposes. Eliminate this.
• "Fever raises the body’s temperature to destroy harmful substances": Many pathogens have an optimal temperature range for growth. Raising body temperature (fever) can inhibit the growth of these harmful substances (like bacteria, viruses) or even kill them, which is part of the immune system's response.
• "Fever triggers inflammation": Inflammation is a separate immune response mechanism, and fever itself doesn't directly trigger inflammation. Eliminate this.
• "Fever causes the secretion of hormones that fight harmful substances": Fever is a result of the body's immune response (like cytokine release), not the cause of hormone secretion to fight pathogens. Hormones related to immunity are regulated by other mechanisms. Eliminate this.

Answer:

B. Fever raises the body’s temperature to destroy harmful substances.