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8/18/2019 8thgrade Ch 1sec 2skeletgrade 8 alsystem 110107081300 Phpapp02
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Ch. 1Sec. 2
TheSkeletal
System
8/18/2019 8thgrade Ch 1sec 2skeletgrade 8 alsystem 110107081300 Phpapp02
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(cranium)
Skeleton model
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Functions of Skeletal System
1. Provides shape & support
2. Enables movement
. Protects internal or!ans
". Produces blood cells
#. Stores certain materialsuntil body needs them
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1. Provides shape & support
$ vertebrae= 2% bonesthat make up
backbone(vertebra sin!ular)
$ 'eborn 2# bones$ *dult 2+% bones
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2. Enables you to move
$ ,uscles pull on bones
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3. Protects internal orans
$ Skull protects brain
$ -ibs protect heart & lun!s
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!. Produces blood cells
$made
by
bonemarro
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". Stores certain materials until
your body needs them
$ calcium & phosphorus
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#ones$ stron & livin
$ ard b/c made of 0a & P$ 0ontain cells & tissues
$ Form ne bone tissue as you !ro
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Structure o% bones
$ outer membrane covers
bone e3cept 4 endscartila!e (connective tissue
more fle3ible than bone)
$ compact bone hard & dense
$ spon!y bone li!htei!ht but
stron!
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Structure o% bones$ marro
5 soft connective tissue 5 found in spaces in bone
5 2 types6
1.1. red bone marro$red bone marro$ producesmost blood cells
2.2. yello bone marro$yello bone marro$ ener!y
reserve
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7one Structure
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$ infant skeleton mostly
cartila!e
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o 7ones 0han!e *s 8e 9ro
:+"6";
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healthy
bones
ell
balanced
diet
e3ercise
ear
safety
e<uipment
0a & P
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osteoporosis$ condition here
body=s bonesbecome eak &
break easily dueto mineral loss
$ more common inomen than men
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'CT()(T* +,--/ ST0ET,+ 1) Students ill roll up a sheet of paper (> 1/2 3 11) about 1 in ide into a cylinder.
?hey ill make of these (paper bones).
2) Students ill stand the bones up on their ends placin! a paper plate on top of the
bones.
) ?eacher ill ask students to tell hat is happenin! the hollo rolls ill support the
plate.
") Students ill be!in to add ei!hts (ooden blocks) to the plate.
#) Students ill count ho many blocks the plate can hold before it collapses the
bones.%) Students ill roll more sheets of paper as ti!htly as they can so that there is no
hollo section.
) Students ill stand these @bones@ up as before placin! the same plate on top of
them.
>) Students ill place ei!hts on top of the plate until they collapse.
A) Students ill deduce hat happened. ?eacher ill e3plain that hollo bones ereable to support more ei!ht. ?eacher ill also e3plain that havin! a hollo center
!ave the bones a better desi!n and made them stron!er. ?eacher ill continue
e3plainin! that the lar!e bones in our body are also hollo hich makes them
stron! so they can support more ei!ht but li!ht so it takes less ener!y to move
them.
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$ place here 2 bones cometo!ether
oint
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2 kinds of Boints6
1. immovable oint$ little or nomovement
$ e!6 skull bones2. movable oints
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ball & socket oint
5!reatest ran!e of motion 5shoulder & hips
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hine oint
$ forard or backard motion
$ knee & elbo
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pivot oint
$ bone rotates around another
$ neck
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lidin oint
$ 1 bone slides over another
$ rist ankle vertebra
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Cideo7one Doints
Skill * ti it 1#Skill * ti
it 1#
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Skills *ctivityp!. 1#Skills *ctivityp!. 1#
Perform these activities.Perform these activities.
$ etermine hich type of movable Boint or Boints isinvolved in performin! each activity. 9ive a reasonto support your classifications.
1. ,ove your arm in a circle.
2. Push open a door.. ift a book from a desk.
". Gneel don.
#. 8ave your hand.
%. ?ist your head from side to side.
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lidin oint hine oint
pivot
oint
immovable
oint
ball & socket
oint
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liament
$ tissue that holds bones in
movable Boints to!ether
7one
abel your body=s frameork ith the scientific name for each bone.
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