41. Immune System

New flu shots are needed every year to protect against infection because of __________.

Besides helper T cells, what are two other types of cells that HIV infects?

When searching for a donor for an organ transplant, doctors try to match the __________ of the donor and recipient as closely as possible.

The idea behind vaccination is to induce __________ without requiring the vaccinated individual to get sick.

A vaccine may contain __________.

A type of cell that makes immunizations effective is the __________.

How do antibodies to foreign blood groups come to exist in the body?

What do the antibodies secreted by plasma cells (the effector cells of humoral immunity) do to attack their targets?

What is the role of dendritic cells in the primary immune response?

Which of the following cell types carries out humoral immunity?

Which of the following functions of plasma-cell-secreted antibodies promotes phagocytosis of foreign bacteria?

The proliferation of the B lymphocyte to which a specific antigen binds is referred to as __________.

Once you have been exposed to an antigen, you develop immunity against the same antigen because __________.

The antigen-binding sites of an antibody molecule are formed from the molecule's variable regions. Why are these regions described as variable?

The body produces antibodies complementary to foreign antigens. The process by which the body comes up with the correct antibodies to a specific invader is most like __________.