© HEB MUSCLES AND MOVEMENT KS3 Biology By Dr H E Bloomfield

© HEB

MUSCLES MUSCLES AND AND

MOVEMENTMOVEMENT

KS3 BiologyKS3 Biology

By Dr H E BloomfieldBy Dr H E Bloomfield

© HEB

How our Muscles How our Muscles WorkWork

Muscles work byMuscles work by

C-------INGC-------ING (getting (getting

shorter and fatter) shorter and fatter)

and pulling on and pulling on

bones.bones.

© HEB

But once contracted, But once contracted, a muscle cannot a muscle cannot -------- again by itself.-------- again by itself.

So each muscle needs So each muscle needs a partner to pull it a partner to pull it longer again and longer again and move the bone back move the bone back in the opposite in the opposite direction.direction.


© HEB


© HEB

Two muscles working Two muscles working

together in opposite together in opposite

directions are calleddirections are called

A------------A------------ muscles. muscles.


© HEB

The The BICEPSBICEPS and and

TRICEPSTRICEPS in our arm in our arm

are are ANTAGONISTICANTAGONISTIC

muscles. They work muscles. They work

as a pair and in as a pair and in

opposite directions.opposite directions.


© HEB


© HEB

Bending our ArmBending our Arm

BICEPS BICEPS contractcontracts and s and bends bends armarm

TRICEPS TRICEPS relaxes relaxes and is and is pulled pulled longerlonger

© HEB

Straightening our Straightening our ArmArm

BICEPS BICEPS relaxes relaxes and is and is pulled pulled longerlonger

TRICEPS TRICEPS contracts contracts and and straightestraightens armns arm

© HEB

How our Muscles WorkHow our Muscles WorkMuscles Muscles are are attached attached to bones to bones by strong by strong non-non-stretchy stretchy TENDONSTENDONS..

musclmusclee

tendontendonss

© HEB

Our Achilles tendon in our Our Achilles tendon in our heelheel

© HEB

How Arm Muscles WorkHow Arm Muscles WorkHow Arm Muscles WorkHow Arm Muscles Work

Hinge joint

© HEB

Muscles, bones and jointsMuscles, bones and jointsMuscles, bones and jointsMuscles, bones and joints

Muscles, bones and joints

© HEB

TAKING TAKING THE THE

STRAINSTRAIN

How How Strong are Strong are

your your Muscles?Muscles?

© HEB

1.1. Put the scales on the bench. Push Put the scales on the bench. Push

down with your fists as hard as you down with your fists as hard as you

can.can.

My result is __________ NMy result is __________ N

© HEB

2.2. Put the scales under the edge of the Put the scales under the edge of the

bench. Push upwards with your hands bench. Push upwards with your hands

as hard as you can.as hard as you can.


© HEB

3.3. Try squeezing the scales with your Try squeezing the scales with your

fingers.fingers.


© HEB

4.4. Hold the scales between your two Hold the scales between your two

palms. Push them together as hard as palms. Push them together as hard as

you can.you can.


© HEB

WHERE DO WHERE DO MUSCLES GET MUSCLES GET THEIR ENERGY THEIR ENERGY

FROM?FROM?

© HEB

Muscles get energy for Muscles get energy for contraction from contraction from R----------R----------

+ ---+ --- ++

----------

ENERGY------- +------- +

------------

© HEB

Energy for Muscle Energy for Muscle ContractionContraction

+ ---+ --- ++

----------

ENERGYGlucose Glucose

++

OxygenOxygen

© HEB

Energy for Muscle Energy for Muscle ContractionContraction

+ + COCO2 2

+ + WateWate

rr

ENERGYGlucose Glucose

++

OxygenOxygen

As the process uses oxygen, it is As the process uses oxygen, it is sometimes called sometimes called aerobic aerobic respirationrespiration..

© HEB

THE ENDTHE END

Documents

© HEB MUSCLES AND MOVEMENT KS3 Biology By Dr H E Bloomfield