1. Muscular System Demonstrate understanding of concepts.

2. TYPES OF MUSCLES Smooth muscles is found in the stomach, intestines and the walls of blood vessels. This type of muscle is involuntary because you cannot control these types of muscles. Cardiac Muscles is found in the heart. This is an involuntary type of muscle because you cannot control your heart muscle. Skeletal muscles are attached to bone, mostly in the legs, arms, abdomen, chest, and face. This is a voluntary type of muscle because you can control the skeletal muscles.

3. Major Muscles of the Human Body

4. Facts About the Muscles System The human body has more than 650 muscles. Muscles are connected to bone by tendons. Muscles pulls on bones to allow movement. Muscles that allow you to move are voluntary/skeletal muscles. Muscles that move without our conscious control are smooth/involuntary muscles. The heart is made up of cardiac muscle. Muscles work in pairs. Muscle cells contract and relax. Smooth muscles react slowly and tire slowly. Skeletal muscles react quickly and tire quickly. Cardiac muscles never tire.