Question

1. what does your immune system do?

a. makes you sick
b. keep your brain sharp
c. protect you from illness
d. make energy for your body

1. define the word antigen. give 3 examples of antigens.

Explanation:

Question 1 (Multiple Choice)

The immune system's main function is to defend the body against pathogens and foreign substances, protecting from illness. Option a is incorrect as the immune system fights sickness. Option b is related to the nervous system. Option d is related to cellular respiration (mitochondria) or digestive/metabolic processes. So the correct option is c.

An antigen is a foreign substance (like a molecule, virus, bacteria, or toxin) that triggers an immune response (antibody production). Examples: 1. Bacteria (e.g., Streptococcus causing strep throat). 2. Viruses (e.g., Influenza virus). 3. Pollen (allergic reactions, recognized as foreign by immune system in sensitive individuals).

Answer:

c. protect you from illness

Question 2 (Definition and Examples)