Immune System WKSHT

1. A cell has become cancerous 2. A cell has been invaded by a virus 3. A cell has been transplanted from another individual

Name three circumstances in which T cells would be activated against body cells: 1. _________________________ 2. _________________________ 3. _________________________

Cells and Chemicals in body fluids

What is an example of innate internal defenses?

Skin and Mucous Membranes

What is an example of surface barriers?

Antigenic Determinant

B and T lymphocytes recognize pathogens by binding to them. What the lymphocyte recognizes is called the ______________ found on the antigen.

Plasma, Antibodies

Specific B cells called ______________ cells secrete ______________, which bind to the antigens.

Markers, Chemical Messengers

This defense mechanism (named in question 6) identifies enemies by recognizing ______________ unique to the pathogens. When they are overwhelmed, they secrete _________________________ to mobilize the adaptive defenses.

Lymphocytes (T & B cells)

What is an example of adaptive defenses?

-Surface Barriers -Innate Internal Defenses -Adaptive Defenses

What are the 3 line of defenses?

Innate Internal Defense

When the surface barriers (innate external defenses) are penetrated, what is the next line of defense?

Humoral

Which type of immunity involves antibodies?

Humoral, B

____________ immunity is directed against pathogens in the extracellular fluid. This immunity involves ____ lymphocytes.

Cellular, T

______________ immunity is directed against pathogens within the cells. This immunity involves ____ lymphocytes.