ppt

1. Muscular
System

2. Muscular System
• Am
uscleismadeof strongtissuethat can
contractinanorderlyw
ay
.
• Y
our m
uscular systemis
madeof different typesof
m
usclesandhasseveral
functions.

3. Muscular System
• Allmuscletissuesaremadeof cellsthatcontract.
• W
h
e
nthecellsof amusclecontract,themuscle
tissuesbecomeshorter
.
• Them
uscletissues
returntotheir
original length
w
hen thecells
relax.

4. Functions
Movement
• M
anyof your m
uscleshelp youm
ove. M
ost of
thesem
usclesattachtobones. Thesem
uscles
makeyour skeletonm
ove.
• W
henm
usclescontract, theym
ovebones.This
m
ovement canbefast, suchasw
henyourun.The
m
ovement canalsobeslow
, suchasw
henyou
stretch.

5. Functions
Movement
• Y
ouhavemanymusclesinyourbodythatarenot
attachedtobones.

6. Functions
Stability
• M
usclesthat areattachedtoyour
bonessupport your bodyandhelpyou
keepyour balance.
• T
endonsattachm
usclestobones.
• T
endonsw
orkw
ithm
usclesandkeep
your jointsinplacew
henyour body
moves.
• T
endonsalsohelpholdyour bodyin
acorrectposture, or shape.

7. Functions

8. Functions
Protection
• M
usclesprotectyour body
.They
cover most of your skeleton.
• M
usclesalsocover most of the
organsinsideyour body
.
• M
usclesarelikealayer of padding.
Theysurroundyour abdomen, chest,
andback, andprotectyour internal
organs.

9. Functions
Temperature Regulation
• Y
our m
uscular systemhelpsyour bodykeepyour
internaltemperaturewithinacertainrange.
• Haveyouever felt coldandthenstartedshivering?
• S
hiveringism
usclesrapidly
contracting.Thischangeschem
ical
energytothermal energy
.The
releasedthermal energyhelps
maintainyour body’stemperature.

10. Functions
• Musclesalsochangechemicalenergytothermal
energyduringexercise.Thisisw
hyyoufeel
w
armafter physical activity
.
Temperature Regulation
• Thisisimportant becauseahuman’sbody
temperaturemuststayaround37°Cinorderfor
thebodytofunctionproperly
.

11. Types of Muscles
• Y
our bodyhasthreedifferent typesof m
uscles:
skeletal smooth cardiac

12. Types of Muscles
skeletal smooth cardiac
• Eachtypeof muscleisspecializedforadifferent
function.

13. Types of Muscles
skeletal
• Musclethatattachestobonesisskeletalmuscle.
• Skeletalmusclesarealsocalledvoluntarymuscles.
• V
oluntarym
usclesarem
usclesthat youcan
consciouslycontrol.

14. Types of Muscles
skeletal
• F
or example, youcancontrol w
hether or not youlift
your leg.Thecontractionsof skeletal m
usclescan
bequickandpow
erful, suchasw
henyourun.
However
,contractingthesemusclesforalongtime
cantirethemor makethemcram
p.

15. Types of Muscles
skeletal
• S
keletal m
usclesw
orkbypullingonbones.
• Musclescannotpushonbones.Instead,muscles
workinpairsandmovethebody.

16. Types of Muscles
skeletal

17. Types of Muscles
skeletal
• Y
our skeletal m
uscles
canchangethroughout
your lifetime.
• If youexercise, your
m
usclecellsget larger
.
Then, your entire
m
usclebecomeslarger
andstronger
.

18. Types of Muscles
skeletal
• Y
our skeletal m
uscles
canchangethroughout
your lifetime.
• If youexercise, your
m
usclecellsget larger
.
Then, your entire
m
usclebecomeslarger
andstronger
.

19. Types of Muscles
cardiac
• Y
our heart ismadeof cardiacm
uscles, w
hich
arefoundonlyintheheart.
• A
cardiacmuscleisatypeof involuntarymuscle,
whichismuscleyoucannotconsciouslycontrol.

20. Types of Muscles
cardiac
• Ascardiacmusclescontractandrelax,they
pumpbloodthroughyour heart andthrough
vesselsthroughout your body
.
• C
ardiacm
usclecellshavebranchesw
ithdiscsat
their ends.Thesediscssendsignalstoother
cardiacm
usclecells.
• Thesignalscauseallthecardiacmusclecellsto
contractat almost thesametime.

21. Types of Muscles
cardiac

22. Types of Muscles
smooth
• Smoothmuscleslineyourbloodvesselsandmany
of your organs.
• S
moothm
usclesareinvoluntarym
usclesnamedfor
their smoothappearance.
• C
ontractionof smoothm
uscleshelpsm
ovematerial
throughyour body
, suchasfoodinyour stomach.
• S
moothm
usclesalsocontrol them
ovement of
bloodthroughyour vessels.

23. Types of Muscles
smooth

24. Types of Muscles
smooth

25. Healthy Muscles
• Y
our m
usclesneedahealthful diet.
• A
ll of your m
usclesuseenergyw
henthey
contract.Thisenergycomesfromthefoodyou
eat.
• Eatingadietfullof nutrientssuchasprotein,
fiber, andpotassiumcanhelpkeepm
uscles
strong.

26. Healthy Muscles
• Exercisealsohelpskeepyourmuscleshealthy
.
• Musclecellsgetsmallerandweakerwithout
exercise. W
eakm
usclescanincreasetheriskof
heart disease.
• Boneinjuriescanhappenmore
oftenw
henm
usclesarenot healthy
.
• J
ointsm
ight not beasstablew
hen
m
usclesaresmall andw
eak.

27. The Muscular System &
Homeostasis
• Therearemanywaysthemuscularsystemhelps
your bodymaintainhomeostasis.
• Y
ourbodytemperaturemuststayaround37°Cto
functionwell.W
h
e
nyourmusclescontract,they
convertchemicalenergytothermalenergy
.The
thermal energykeepsyour bodyw
arm.

28. The Muscular System &
Homeostasis
• W
h
e
nyouexercise,yourcellsusemoreoxygenand
releasemorew
aste, suchascarbondioxide.
• Thecardiacm
usclesinyour heart helpmaintain
homeostasisbycontractingmoreoften.
• W
henyour heart contractsfaster, it pumpsmore
bloodandmoreoxygeniscarriedtothecells.