AP BIOLOGY

Detailed explanation-1: -The immune system is the body’s defense against infections. The immune (ih-MYOON) system attacks germs and helps keep us healthy.

Detailed explanation-2: -What is the immune system? The immune system defends the body from infection. It is made up of a complex network of cells, chemicals, tissues and organs. An underactive or overactive immune system can cause health issues. The immune system’s job is to protect the body from infection.

Detailed explanation-3: -The immune system provides two levels of defense: innate and adaptive immunity. This discussion will begin with a brief description of the organs and tissues associated with the immune system and then focus on the cells that provide innate and adaptive immunity.

Detailed explanation-4: -The innate immune system is the body’s first line of defense against germs entering the body. It responds in the same way to all germs and foreign substances, which is why it is sometimes referred to as the “nonspecific” immune system.