Skin helps the body maintain a steady _____________ through perspiration and enlarging
of blood vessels.

Digestion begins in the _____________

The human heart has _____________ chambers (rooms).

The top chambers of the heart are called the _____________.

The bottom of the heart is called the _____________.

Arteries, Veins, and capillaries are the _____________ in the circulatory system.

This blood type is called the "universal donor:

The main organ in the respiratory system is the _____________.

In which structure is blood filtered within the kidneys?

Water, urea, and other wastes are eliminated in a fluid called _____________.

The _____________ makes urea and breaks down old red blood cells.