1 / 24

Muscular System

Muscular System. Notes 13-3. Muscular System has many functions:. Movement Body temperature Posture Food source. Work with skeletal system to move body contract = shorten/tighten Muscles PULL bones, never push muscle cells are called muscle fibers

sancho
Download Presentation

Muscular System

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Muscular System Notes 13-3

  2. Muscular System has many functions: • Movement • Body temperature • Posture • Food source

  3. Work with skeletal system to move body contract = shorten/tighten Muscles PULL bones, never push muscle cells are called muscle fibers Often work in pairs/groups for one movement Function: Movement

  4. Function: Body Temperature • HOMEOSTASIS: Muscle contraction releases heat to keep your body the right temperature • Shivers: fast muscle contractions to raise body temperature

  5. Most muscles always hold a little bit of contraction/tension Tension = “muscle tone” Keep you standing up straight (posture) Function: Maintain Posture

  6. Function: Food Source • Meat that you eat is muscle!

  7. Skeletal Muscle Smooth Muscle Cardiac Muscle Skeletal = you control it (called VOLUNTARY) Smooth/Cardiac = you don’t control it (called INVOLUNTARY) Types of Muscle Tissue

  8. Attached to your skeleton by tendons (CT) Voluntary Structure = bundles of fibers striated Examples: quadriceps, biceps, triceps, abs, etc. React quickly, tire quickly Skeletal Muscle

  9. Skeletal Muscle: Bundles of Fibers

  10. Skeletal muscles cross joints And work in pairs by contracting and relaxing.

  11. Muscles at Work • Because muscle cells can only contract, not extend, skeletal muscles must work in pairs. While one muscle contracts, the other muscle in the pair relaxes to its original length.

  12. FUN Facts! There are more than 630 muscles in the body. On average, the body weight is 40% muscle. Out of the 630 muscles, 30 of them are facial muscles, which help to create all those different faces of happiness, surprise, joy, sorrow, sadness, fright, etc. The biggest muscle in the bodyis the gluteus maximus (buttock)

  13. Smooth Muscle • Inside organs • Involuntary (automatic movements) • Shorter fibers than skeletal muscle • React slowly, tire slowly • Example: pushes food through stomach and intestines

  14. Cardiac Muscle • Fibers have branched shape (like tree branches) that form webs and layers • Make up the heart <3 • Striated • Involuntary • Never tire

  15. Cardiac Muscle: Branched Fibers

  16. Muscle Types: Fiber Shapes

  17. Tendons • Attach muscles to bones • White skinny part of muscle • “Gristle”

  18. Muscles and Exercise • Soreness DURING exercise: chemicals build-up as you use up energy (lactic acid) • Soreness AFTER exercise: tears and damage to muscle fibers • Healing and replacement of damaged cells = muscle growth • The muscle gets thicker and therefore stronger

  19. Can Muscles get hurt? It is possible to hurt a muscle because they can become pulled, hence "pulled muscle." Can actually tear a muscle the same way that a ligament or tendon gets torn or a bone gets broke. And they can heal themselves with rest and time. Muscles can also cramp, which is when a muscle stays contracted

  20. Skeletal muscles “mature” and strengthen as you grow up Increase coordination Babies can’t lift head (neck muscles still weak) Skeletal Muscle Development

  21. Muscular System Video http://youtu.be/RsWNyqnHQ2I

More Related