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The foreign, or “non-self” substances that trigger immune responses are called ______.

Blood from the face and scalp is drained by the

Three blocks are connected as shown. The ropes and pulleys are of negligible mass. When released, block C moves downward, block B moves up the ramp, and block A moves to the right. After each block has moved a distance d, the force of gravity has done: A. positive work on A, B, and C. B. positive work on A and B, and negative work on C. C. zero work on A, positive work on B, and negative work on C. D. zero work on A, negative work on B, and positive work on C.

A substance that can stimulate a primary immune response but is unable to produce the symptoms of a disease is a(n) ______.

A lymph node consists of

Lipid-soluble substances diffuse through channels in cell membranes of cells forming the capillary wall, whereas lipid-insoluble substances diffuse through most areas of the capillary cell membranes.

The loss of teeth is most commonly associated with diseases of the

A transplant recipient’s body rejects a transplanted organ because her ______ does not match that of the donor closely enough.

Once cells in the SA node reach threshold,

Normal immune responses require T and B lymphocytes.