1. Muscles Human Body - more than 650 muscles Muscle makes up half a person’s body weight

2. Types of Muscles Skeletal Muscle Attached to Bone Smooth MuscleAutomatic Control Cardiac MuscleYour Heart

3. Skeletal Muscles: Voluntary muscles that are attached to bones and help them move.

4. Hamstring Pectorals Deltoids Abdominal Obliques Quadriceps Gastrocnemius Trapezius Latissimus Dorsi Triceps Gluteus Maximus Soleus Biceps

5. Smooth Muscles: Involuntary muscle tissue that lines the inside of blood vessels, intestines, and stomach.

7. Cardiac Muscles: Involuntary muscles that make up the heart.

8. How Muscles Cause Movement

9. Muscles Can only Pull on tendons Often work in pairs Flexors and Extensors

11. Movement Muscle Pulls on Moves Bone Contracts Tendon at Joint

12. How do bones and Muscles Cause Movement? Biceps – Muscles on the top of the upper arm. Triceps – Muscles on the bottom of the upper arm When I flex my arm, My bicep contracts and condenses and my triceps stretches and relaxes. When my arm is straight, My bicep stretches and relaxes and my triceps contracts and condenses. Explanation of Activity Skeletal muscles work in pairs to move parts of your body. When one muscle contracts (condenses; shortens) the other stretches and relaxes. When the arm is flexed… The bicep contracts and pulls the bone on the forearm causing the arm to bend at the joint in the elbow. The triceps stretches and relaxes when this happens. When the arm is straight… The tricep contracts and pulls the bone on the forearm causing the arm to straighten at the joint in the elbow. The biceps stretches and relaxes when this happens.