Muscles move by ______

It takes two muscle groups to move a _____

What cell organelle corresponds most closely to the muscular system?

Work is the amount of energy transferred by a ____ moving a _____

What does a Smooth Muscle do?

What is a involuntary muscle?

What is a voluntary muscle?

What is an example of an Involuntary muscle?

What is an example of a Voluntary muscle

The muscular system is a complex collection of ____

When a muscle _____, it pulls on the _____ at the end of the muscle which is attached to the bone.

The bone is moved like a _____.

What does the opposing muscle group have to do when you have to move the object back to it's original position?

How many muscles are in the body?