The heart has how many chambers?

The circulatory system is composed of __________.

The heart is located near the center of your __________.

The heart is about the size of your __________.

The right side of the heart pumps blood __________ the heart __________ the lungs.

What happens when the food reaches the stomach?

Where does the partly-digested food (in liquid form) go after it leaves the stomach?

The digestive system processes food into usable and unusable materials. The usable materials are sent to the body's cells as food. What happens to the unusable materials? 

Digestion takes place in a long tube-like canal called alimentary canal or digestive tract. Food travels thru these organs in the following order:

Solid waste leaves the body through the rectum then the anus. Liquid waste leaves the body after passing through the __________