What are the ways a person becomes immune, the definitions of antigen and antibody, ways to maintain good health, and functions of public health authorities?

Here are the answers to your questions:

5. A person becomes immune to diseases primarily through two ways: natural immunity by being exposed to a pathogen and developing memory cells, or artificial immunity through vaccination, which introduces a weakened or inactive form of a pathogen to stimulate an immune response without causing illness.

6. An antigen is any substance (usually foreign) that triggers an immune response in the body, such as parts of bacteria, viruses, or toxins. An antibody is a protein produced by the immune system in response to an antigen, specifically designed to recognize and neutralize that particular antigen.

7. Four ways good health can be maintained are:

   • Eating a balanced diet rich in fruits, vegetables, and whole grains.
   • Engaging in regular physical exercise.
   • Ensuring adequate sleep (7-9 hours for adults).
   • Practicing good hygiene, such as handwashing.

8. Four functions of public health authorities are:

   • Disease surveillance and control (e.g., tracking outbreaks).
   • Health promotion and education (e.g., campaigns on healthy living).
   • Ensuring environmental sanitation (e.g., clean water and waste management).
   • Implementing vaccination programs to prevent infectious diseases.