Muscles

What is a muscle?

• It is an organ that does not need the support of bones.

• It is a strong tissue that contracts in an orderly way.

What happens when a muscle contracts?

• The cells of the muscle become shorter.

• The cells of the muscle become longer.

What happens when a muscle relaxes?

• The cell of the muscle returns to their original length.

• The cells of the muscle become bigger.

What are mitochondria?

• They help the muscle contract and lengthen.

• They are the main energy producers in a cell.

Why is mitochondria important for the muscles?

• Because the muscles need a lot of energy to function and muscles are filled with them.

• Because they are part of the muscles.

Besides the muscular system which is the other organ system that helps the body move?

• The digestive system.

• The skeletal system.