According to the Centers for Disease Control (CDC), a diagnosis of AIDS is made when ______.

In males, reproductive cells are called spermatozoa.

A common complication of __________ is the possibility of a secondary bacterial infection.

____________ occurs when the smooth muscles in the arterial walls relax and the diameter of the vessel enlarges.

Which condition is caused by a viral infection?

____________ occurs when the smooth muscles in the arterial walls relax and the diameter of the vessel enlarges.

A bolus is a soft ball of food created by the action of the teeth, tongue, and saliva.

__________ coordinate immune defenses and kill organisms in cells on contact.

__________ coordinate immune defenses and kill organisms in cells on contact.

The __________ is the functional unit of the kidney.