AP BIOLOGY

Detailed explanation-1: -Innate immune cells are the body’s first line of defense. They quickly respond to foreign cells to fight infection, battle a virus or defend the body against bacteria. Our acquired immunity-also called adaptive immunity-uses T-cells and B-cells when invading organisms slip through that first line.

Detailed explanation-2: -T cells can wipe out infected or cancerous cells. They also direct the immune response by helping B lymphocytes to eliminate invading pathogens. B cells create antibodies. B lymphocytes, also called B cells, create a type of protein called an antibody.

Detailed explanation-3: -Lymphocyte There are two main types of lymphocytes: B cells and T cells. The B cells produce antibodies that are used to attack invading bacteria, viruses, and toxins. The T cells destroy the body’s own cells that have themselves been taken over by viruses or become cancerous.

Detailed explanation-4: -Physical barriers, including the skin and mucosa of the digestive and respiratory tracts, help eliminate pathogens and prevent tissue and/or blood infections. Moreover, components that are secreted by the skin or mucosa, such as sweat, saliva, tears, mucous, help provide a basic barrier against invading pathogens.