1. Muscular System Did you know? It takes 13 muscles to smile and an average of 45 to frown!

2. I. Function (job) of the Muscular System A.Make all your daily movements possible B.Locomotion: Providing movement for the body 1.Keep your heart beating 2.Pull your mouth into different expressions 3.Makes your digestive system work 4.Keep you breathing 5.Move the bones of your skeleton

4. Question 1.What are the main jobs of the muscular system? a. b. c. 2. How does the muscular system work with the skeletal system?_______________________ _________________________________ ____

5. Question 1.What are the main jobs of the muscular system? Keep your heart beating, pull your mouth into different expressions, makes your digestive system work, keep you breathing, and move the bones of your skeleton. 2. How does the muscular system work with the skeletal system? The muscular system moves your bones. The skeletal system provides shape and support and enables you to move with the aid of the muscular system.

6. ll. Muscular System subsystems and the components that work together to support the system A. Three Types of Muscles 1.Skeletal Muscle a.Attached to the bones of your skeleton b.Provide the force that move your bones 1.Tendon- strong connective tissue that attaches muscle to bone c.Appear striated or banded (sometimes called striated muscles) d.Voluntary– you can control these muscles e.React very quickly …..but tire quickly

7. 2. Smooth Muscle a.Found inside many internal organs ex. walls of stomach and blood vessels b.Involuntary muscle- work automatically to control many types of movement inside your body ex. digestion c.Appear not striated…smooth d.React more slowly…. Tire more slowly

8. 3. Cardiac Muscle a.Found in the heart b.Involuntary muscle- work automatically c.Appear striated d.Do not get tired.. Contracts repeatedly 70 times per minute every day(heartbeats)

9. Questions 1.List the three types of muscles and explain what each does. a._________________ ________________ b._________________ ________________ c._________________ ________________

10. Questions 1.List the three types of muscles and explain what each does. a.Skeletal- attaches to our bones and provides force for you to move. b.Smooth- make up internal organs- work automatically to control internal movements c.Cardiac- keep heart beating

11. How Muscles Work A.Muscles do work by contracting 1.Become shorter and thicker B.Contract when they receive messages from nervous system C.Must work in pairs- because they can only contract not extend 1.One muscle of the pair contracts the other muscle relaxes – they always pull never push D.Muscle can become smaller or larger 1.Muscle size is due to increase in number of muscle cells and mostly because of individual muscle cells become larger due to exercise 2.No exercise – muscles become flabby and become smaller in size

12. Questions 1.What are the subsystems of the muscular system? List 2 components of each. __________________________________ __________________________________ __________________________________ 2.Explain what would happen of one of the subsystems in the muscular system stopped working. __________________________________ __________________________________ __________________________________