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.

The apical heartbeat is heard by listening between the fifth and sixth ribs about 7.5 cm left of the midline.

The hormone called secretin functions to

Water and dissolved substances leave the arteriole end of a capillary due to __________, and enter the venule end of a capillary due to __________.

The condition called acute pancreatitis is often caused by the conversion of

Type B, or serum, hepatitis can be transmitted by means of

When nutrients are digested but are not taken in by the intestinal tissues, the condition is called

Lymph nodes filter lymph, whereas the spleen filters ______.