1. The Muscular System Ch. 15.3 Smooth Muscle is found in the digestive tract and the walls of blood vessels. Cardiac Muscle is found only in the heart. Skeletal Muscle is attached to the bones and helps you move. It also helps protect your inner organs.

2. 2 Types of Muscle Action Muscle action that is under your control is voluntary. Muscle action that is not under your control is involuntary.

3. Aerobic exercise is exercise like cycling or running that improves your heart’s ability to pump oxygen rich blood efficiently through your body Resistance exercise is working against the weight of an object to build muscle strength and size (push ups, weightlifting)

4. Flexor- a muscle that bends part of your body Extensor- a muscle that straightens part of your body Tendon- tissue that connects skeletal muscle to bones Tendinitis- a condition in which the tendon becomes inflamed