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Begin. The Muscular System. POWER. Yeah…just like that!. #1 Review. Function = job Structure = a part/object Homeostasis = keeping balance in the body. Equilibrium inside. Stimulus : Response = how the body responds to changing conditions. #2 Muscular System Overview.

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  1. Begin

  2. The Muscular System POWER Yeah…just like that!

  3. #1 Review Function = job Structure = a part/object Homeostasis = keeping balance in the body. Equilibrium inside. Stimulus : Response = how the body responds to changing conditions

  4. #2 Muscular System Overview What makes up the most weight in your body? Bones? Fat? Skin? Fingernails? Something else? Of course, it’s muscle! The same goes for a cow. All those cuts of beef that we like are just the cow’s muscles surrounded by fat. Yep! Your muscles do more than just move you around, though. Let’s see.

  5. P O W E R #3 Muscular Sys. Overview You have over 600 muscles responsible for moving body parts, but many more muscles work internally to keep you going. The muscular system consists of all the muscles in your internal organs, as well as those attached to bones.

  6. #4 FUNCTIONS of the Muscular System How do muscles cause movement? Well, muscles are masters of pulling on bones. They can’t push at all—they’re not built that way. But they can pull, pull, pull. 1. moves body parts by contracting (getting shorter) 2. controlslife functions (breathing, heartbeat, digestion, etc.)

  7. #5 Muscle Control Can you rub your tummy while you pat your head? Try it. Whether or not you succeeded, you at least were able to move around and give it a shot because you wanted to. Now, stop your heart from beating. If you can’t, make your stomach quit squishing up your most recent meal. Some muscles are controllable by your thinking, other’s aren’t! A voluntary musclecan be controlled by thinking. For example, the biceps of your upper arm. Involuntary muscles automatically contract on their own, such as your stomach.

  8. #6 STRUCTURES—Types of Muscle Muscles aren’t all built the same way, because they have different jobs to perform. The STRONGEST muscles you have are the ones that you’d use to shove a refrigerator around or swing a golf club hard with. They’re strong, but tire pretty quickly.  These are called: 1. skeletal muscles Two things about skeletal muscles: a.) they’re all voluntary and b). they are attached to bones & structures needing movement

  9. triceps straightens it biceps bends the arm #7 Structures/Types of Muscle, contd. Skeletal muscles that move your body around come in two varieties: flexors and extensors. Flexors and extensors usually work in pairs, as seen here: i. flexor – bends a joint (biceps) ii. extensor – straightens a joint (triceps)

  10. Layers of smooth muscle make the stomach able to grind food #8 Structures/Types of Muscle, contd. Another type of muscle, called smooth muscle, is found lining the internal organs. Acting like rings of rubber bands, they are good at changing the shape and thickness of organs like your intestines, your bladder, and your blood vessels. 2. smooth muscles • they’re involuntary, working • automatically • b. found in internal organs • (intestines, blood vessels)

  11. #9 Structures/Types of Muscle, contd. Not EVERY one of your internal organs uses smooth muscle to run, though. We’ve already talked about your heart and its never-resting job. The heart is made of cardiac muscle, which never has to rest to keep going for as long as you live. 3. cardiac muscle a. involuntary, thankfully b. found onlyin the heart so, those are the three types of muscle, what they do, and where they’re found!

  12. #10 DISORDERS of the Muscular System Let’s not play around. Come here, Joe. Please, please, please no osteoporosis! No worries, Joe. Osteoporosis was a skeletal system disorder. You’re safe.

  13. #11 Disorders, contd. There are many reasons why someone would be confined to a wheelchair. Brain or nerve damage (paralysis) could be one, but another genetic birth defect that affects thousands around the country is muscular dystrophy. Muscular dystrophy is a disease where a person’s muscles weaken after birth and the sick have little control over them. Over time, people with M.D. will often end up in wheelchairs as their muscles fail them. Their minds are completely healthy, though. No cure currently exists for this disease. The MDA (Jerry’s Kids) is the most prominent charity searching for a cure.

  14. #12 Disorders, contd. The drive to be bigger, “better” looking, or an improved athlete has caused people to pursue any means possible to achieve these goals. *sigh* Looks like Joe’s got quite a goal set for himself.

  15. #13 Disorders, contd. Joe gets to work… …and finds that instantaneous results aren’t exactly happening. Like so many people, Joe gets frustrated, wants the easy way to success, and looks for a short cut.

  16. #14 Disorders, contd. Joe meets up with a shady character known to provide illegal drugs at the local gym. Which drug is Joe after? Anabolic steroids. Dang, Joe, what are you doing? You’re breaking the law, spending a lot of money, and you’re about to wreck your body when some hard work & persistence would’ve gotten you where you wanted.

  17. #15 Disorders, contd. The steroids work. That’s why so many people risk so much—jailtime, humiliation, losing friends, families, careers, and even permanent health problems and DEATH. Joe is so single-minded, though, that those risks don’t matter to him. He’s just glad they work. We’ve got to keep this powerpoint rated PG, so we’re going to have to skip the health problems that are about to affect Joe. Sorry. However, please realize that abusing anabolic steroids doesn’t just cause embarrassing side effects. Joe is now at risk for several LIFE- THREATENING conditions that could easily KILL him. You’ll read more about another day.

  18. #16 Disorders, contd. Joe made a bad, horrible choice. If he was doing the steroids to make him better at sports, he’d be nothing but a cheater. In this case, all he cheated was his health, which is never, ever worth it. Steroid abuse can lead to dozens of side effects due to way too many hormones. The effects can be embarrassing to deadly. Here are just a few: Men: shrunken genitals, stunted growth, cancer Women: shrunken breasts, body hair, cancer This should be an easy decision for everyone. Anything illegal that has to be injected to work is illegal for a reason. Stayofftheroids.

  19. Gotta Have This System! #17 Review Why is the muscular system important? What if Joe’s disappeared? Function 1: allows for movement Joe would collapse to the ground and never be able to eat, drink, or fight off any attacker. He’d die of thirst, starvation, or being eaten by fire ants. Function 2: used in internal organs for life functions Joe would instantly empty his bladder, he’d, uh, poop his pants, he’d stop digesting his food, he’d stop moving air in & out of his body, and his blood would come to a standstill. Give him about 5 minutes, max. Help!?!

  20. #18 Review, contd. Homeostasis? The muscles in your body keep your bloodflow and breathing going at whatever rate your body needs at the moment. Also, they allow you to digest food, eliminate certain wastes, and can even warm your body up. Stimulus : Response How about… You are feeling really cold : your body shivers, trying to warm you up

  21. #19 And That’s… Da End!

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