IMMUNOLOGY

Detailed explanation-1: -Your immune system is made of up a complex collection of cells and organs. The system works together to protect you from germs and helps you get better when you get sick.

Detailed explanation-2: -White blood cells are the key players in your immune system. They are made in your bone marrow and are part of the lymphatic system. White blood cells move through blood and tissue throughout your body, looking for foreign invaders (microbes) such as bacteria, viruses, parasites and fungi.

Detailed explanation-3: -Organs and tissues important to the proper functioning of the immune system include the thymus and bone marrow, lymph nodes and vessels, spleen, and skin.

Detailed explanation-4: -1.1st line of defense (not a part of the immune system): The skin (physical defense) and chemicals (the linings of the body cavities) act as barriers to infection. 2.