The two arms of adaptive immunity are antibody-mediated immunity, which operates through the production of the proteins called _______, and cell-mediated immunity, which works through the production of cells that destroy infected _______ in the body. The central cells of antibody-mediated immunity are known as _______ cells, while the central cells of cell-mediated immunity are known as _______ cells.

An antibody is an immune system protein that can bind to a particular _______. Antibodies are seen in two forms: as receptors on the surface of _______ cells and as free-standing proteins that are _______ by these cells.

The cells of both antibody-mediated and cell-mediated immunity exist in great numbers in nodes of the body’s fluid- drainage network, the _______.

A B cell that has become activated against a given microbe divides rapidly to produce clones of two types of daughter cells: _______ cells, which produce the antibodies that will directly fight the invader, and _______ cells, which will remain in the body long after the infection has passed.

T cells specific to a given invader become activated by binding to a cell whose central function is to initiate adaptive immunity by displaying microbial antigens. These are the _______ cells, the most important of which is the _______ cell.

AIDS is devastating to the immune system because the virus that causes it has, as its primary target, the _______ cells that are central to both cell- and antibody-mediated immunity.

Toll-like receptors are the primary _______ of microbial infection in the human body and also serve to ______ both the innate and adaptive immune responses.

Invading microbes can be ingested whole by various members of the class of immune system cells known as ______.

An antigen is any substance that _______.

The human body’s first line of defense against invading pathogens is not the immune system, but rather a set of physical ______ to infection, the most important of which is .

The innate immune response will target any object in the body perceived to be _____, while the adaptive immune response targets ______.