Bicarbonate ion is made in the blood plasma.

The serous membrane that surrounds the lungs is called the pleura.

Blood moving from a vein to a capillary and back to a vein is called _____ circulation.

The external sphincter is a ____________ muscle and found ___________.

The ascending loop of Henle is permeable to water but not to sodium.

Select all of the following specializations which increase surface area to aid in the absorption of nutrients in the small intestine.

Manufacturers of some medications used to treat heartburn advertise that their products shut down the acid-producing pumps in the stomach. Which of the following cells are they referring to?

The functional unit of the liver is the

In the lungs, the main site of gas exchange between oxygen and carbon dioxide is the ___________.

Segmentation is an example of mechanical digestion.