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

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

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

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

In an autoimmune disease, the immune response is directed toward

Lymph nodes filter lymph, whereas the spleen filters ______.