AP BIOLOGY

Detailed explanation-1: -Exogenous antigens come from foreign substances that can enter your body through your nose, your mouth or cuts in your skin. These include viruses, bacteria, pollen, parasites and fungi.

Detailed explanation-2: -When the body senses foreign substances (called antigens), the immune system works to recognize the antigens and get rid of them. B lymphocytes are triggered to make antibodies (also called immunoglobulins). These proteins lock onto specific antigens.

Detailed explanation-3: -A foreign substance that invades your body is called an antigen . 8. When your body detects an antigen, antibodies are made and lock onto it. Once an antigen is recognized, your immune system can remember it the next time and protect you from getting sick again.

Detailed explanation-4: -antigen, substance that is capable of stimulating an immune response, specifically activating lymphocytes, which are the body’s infection-fighting white blood cells. In general, two main divisions of antigens are recognized: foreign antigens (or heteroantigens) and autoantigens (or self-antigens).

Detailed explanation-5: -Activation of specialized antigen-presenting cells is a necessary first step for induction of adaptive immunity. The induction of an adaptive immune response begins when a pathogen is ingested by an immature dendritic cell in the infected tissue.