Re is the first place digestion occurs?

Blood returns to the heart through the ______________.

On the diagram which of these is number 4?

True or False? The esophagus connects to the mouth and the small intestine.

_________ makes moving easier by reducing friction that might happen if bones are rubbed together.

Which system starts the process of breathing?

Which is a protein that helps break down food molecules?

strong, flexible tissue that covers the ends of bone

A tube like passage at the top of the throat is called the ______

Tiny fingerlike projections in the small intestine.

Which of these is a function of the skeletal system?

True or False? Most digestion takes place in the stomach.

Muscles that you are able to control are _______.

What holds bones together at the joints?

Where is the cardiac muscle found?

The windpipe

one of the two lower chambers of the heart

muscles you cannot control

A network of blood vessels that carries blood to and from the heart.

The network of vessels that carries blood to and from the lungs.

A network of blood vessels that supplies the heart cells with blood