PATHOLOGY

Detailed explanation-1: -Your immune system is your body’s defense against infections and other harmful invaders. Without it, you would constantly get sick from germs, such as bacteria or viruses.

Detailed explanation-2: -The immune system has a vital role: It protects your body from harmful substances, germs and cell changes that could make you ill. It is made up of various organs, cells and proteins. As long as your immune system is running smoothly, you don’t notice that it’s there.

Detailed explanation-3: -Answer and Explanation: a. Its machinery consists of billions of red blood cells. False, the immune system does not use red blood cells to fight infection.

Detailed explanation-4: -Without it, you would constantly get sick from bacteria or viruses. Your immune system is made up of special cells, tissues, and organs that work together to protect you.