8thgrade ch 1sec 2skeletgrade 8 alsystem 110107081300 phpapp02

8/18/2019 8thgrade Ch 1sec 2skeletgrade 8 alsystem 110107081300 Phpapp02

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Ch. 1Sec. 2

TheSkeletal

System



(cranium)

Skeleton model

http://www.bio.psu.edu/people/faculty/strauss/anatomy/skel/skeletal.htm

http://www.bio.psu.edu/people/faculty/strauss/anatomy/skel/skeletal.htm



Functions of Skeletal System

1. Provides shape & support

2. Enables movement

. Protects internal or!ans

". Produces blood cells

#. Stores certain materialsuntil body needs them



1. Provides shape & support

$ vertebrae= 2% bonesthat make up

backbone(vertebra sin!ular)

$ 'eborn 2# bones$ *dult 2+% bones



2. Enables you to move

$ ,uscles pull on bones



3. Protects internal orans

$ Skull protects brain

$ -ibs protect heart & lun!s

http://www.sculpturegallery.com/sculpture/modern_venus_with_rose.html



!. Produces blood cells

$made

by

bonemarro



". Stores certain materials until

your body needs them

$ calcium & phosphorus



#ones$ stron & livin

$ ard b/c made of 0a & P$ 0ontain cells & tissues

$ Form ne bone tissue as you !ro



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!



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



7one Structure



$ infant skeleton mostly

cartila!e



o 7ones 0han!e *s 8e 9ro

:+"6";



healthy

bones

ell

balanced

diet

e3ercise

ear

safety

e<uipment

0a & P



osteoporosis$ condition here

body=s bonesbecome eak &

break easily dueto mineral loss

$ more common inomen than men



'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.



$ place here 2 bones cometo!ether

oint



2 kinds of Boints6

1. immovable oint$ little or nomovement

$ e!6 skull bones2. movable oints



ball & socket oint

5!reatest ran!e of motion 5shoulder & hips

http://www.shockfamily.net/skeleton/BALLSOCK.MOV



hine oint

$ forard or backard motion

$ knee & elbo



pivot oint

$ bone rotates around another

$ neck



lidin oint

$ 1 bone slides over another

$ rist ankle vertebra



Cideo7one Doints

Skill * ti it 1#Skill * ti

it 1#



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.



lidin oint hine oint

pivot

oint

immovable

oint

ball & socket

oint



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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8thgrade ch 1sec 2skeletgrade 8 alsystem 110107081300 phpapp02

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