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Muscular System Notes 13-3. Muscular System has many functions: Movement Movement Body temperature Body temperature Posture Posture Food source Food source.

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Presentation on theme: "Muscular System Notes 13-3. Muscular System has many functions: Movement Movement Body temperature Body temperature Posture Posture Food source Food source."— Presentation transcript:

1 Muscular System Notes 13-3

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

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

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

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

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

7 Types of Muscle Tissue 1. Skeletal Muscle 2. Smooth Muscle 3. Cardiac Muscle Skeletal = you control it (called VOLUNTARY) Skeletal = you control it (called VOLUNTARY) Smooth/Cardiac = you don’t control it (called INVOLUNTARY) Smooth/Cardiac = you don’t control it (called INVOLUNTARY)

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

10 Skeletal Muscle: Bundles of Fibers

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

13 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. 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.

14 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 body is the gluteus maximus (buttock)

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

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

17 Cardiac Muscle: Branched Fibers

18 Muscle Types: Fiber Shapes

19 Tendons Attach muscles to bones Attach muscles to bones White skinny part of muscle White skinny part of muscle “Gristle” “Gristle”

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

22 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

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

24 Muscular System Video


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