Question

specific defenses: the immune system

• recognize \self\ and

onself\ based upon _.(think back to blood typing). self - proteins are recognized and left alone in a healthy system.

• antigens have \_\ proteins and activate immune responses
• lymphocytes

o b and t cells both recognize _ and start in the bones, with t cells maturing in the _
o b cells have _ antibodies and discover pathogens in body fluids
o t cells must be _ with an antigen by infected cells or immune cells

• humoral and cell - mediated immunity

o _ - antibodies bind to antigens and are tagged to be destroyed
o _ - destroyed cells send signals of infection

Explanation:

The immune - system recognizes self and non - self based on surface proteins. Antigens have "nonself" proteins. B and T cells recognize antigens, starting in bone marrow with T cells maturing in the thymus. B cells have surface antibodies. T cells must be presented with an antigen. Humoral immunity involves antibodies binding to antigens and cell - mediated immunity involves destroyed cells sending infection signals.

Answer:

1. Surface proteins
2. Nonself
3. Antigens; Thymus
4. Surface
5. Presented
6. Humoral immunity
7. Cell - mediated immunity