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SLIDE 1 M: The muscular system. By Alexandra Mellor and Melody Paul.

SLIDE 2 M: Welcome! Today we will explore the muscular system! Let's get started. Involuntary muscles act on their own. Muscles that control your breathing and digestive system are involuntary muscles. Voluntary muscles are under your conscious control. Frowning, standing up, and picking up your ipod involve voluntary muscles. SLIDE3 A: There are three different types of muscle. Skeletal muscles-also known as striated muscle- are attached to your bones and provide the force that makes your bones move and are voluntary. Smooth muscle is found in many of your organs and blood vessels, and control things like digestion. Smooth muscle is involuntary. And cardiac muscle is only in your heart, and is also involuntary.

SLIDE 4 M: Muscles contract when they get messages from your nerves. Since muscles can't extend, and only contract, they work in pairs. When one muscle contracts, the other one relaxes.

SLIDE 5 A: Your tendons, muscles, and movement are all connected, different though these words seem. First, you have to understand a little more about tendons A tendon is a strong tissue that holds your muscle to bone. Because your tendons hold muscle to bone you can move. Without tendons, your muscles would not be able to move with your bones, because there would be nothing holding the muscle to the bone.

SLIDE 6 M: Muscles can be injured. Many small injuries can heal on their own over time- like sprains and strains- but a few more extensive injuries involve doctor assistance.

SLIDE 7 A: Exercise is important! Participating in sports makes your muscles strong and more flexible. Stretching after you warm up gets your muscles ready for more vigorous work. Did you know that exercising releases endorphins in your brain that makes you feel happy the same way that chocolate does?

SLIDE 8 A: Thanks for watching! We hope that you learned something new about the muscular system!