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

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Presentation on theme: "© HEB MUSCLES AND MOVEMENT KS3 Biology By Dr H E Bloomfield."— Presentation transcript:

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

2 © HEB How our Muscles Work Muscles work by C ING (getting shorter and fatter) and pulling on bones.

3 © HEB But once contracted, a muscle cannot again by itself. So each muscle needs a partner to pull it longer again and move the bone back in the opposite direction. How our Muscles Work

4 © HEB How our Muscles Work

5 © HEB Two muscles working together in opposite directions are called A muscles. How our Muscles Work

6 © HEB The BICEPS and TRICEPS in our arm are ANTAGONISTIC muscles. They work as a pair and in opposite directions. How our Muscles Work

7 © HEB How our Muscles Work

8 © HEB Bending our Arm BICEPS contracts and bends arm TRICEPS relaxes and is pulled longer

9 © HEB Straightening our Arm BICEPS relaxes and is pulled longer TRICEPS contracts and straightens arm

10 © HEB How our Muscles Work Muscles are attached to bones by strong non- stretchy TENDONS. muscle tendons

11 © HEB Our Achilles tendon in our heel

12 © HEB How Arm Muscles Work Hinge joint

13 © HEB Muscles, bones and joints

14 © HEB TAKING THE STRAIN How Strong are your Muscles?

15 © HEB 1.Put the scales on the bench. Push down with your fists as hard as you can. My result is __________ N

16 © HEB 2.Put the scales under the edge of the bench. Push upwards with your hands as hard as you can. My result is __________ N

17 © HEB 3.Try squeezing the scales with your fingers. My result is __________ N

18 © HEB 4.Hold the scales between your two palms. Push them together as hard as you can. My result is __________ N

19 © HEB WHERE DO MUSCLES GET THEIR ENERGY FROM?

20 © HEB Muscles get energy for contraction from R ENERGY

21 © HEB Energy for Muscle Contraction ENERGY Glucose + Oxygen

22 © HEB Energy for Muscle Contraction + CO 2 + Water ENERGY Glucose + Oxygen As the process uses oxygen, it is sometimes called aerobic respiration.

23 © HEB THE END


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