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

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

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

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

3 How our Muscles Work 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. © HEB

4 How our Muscles Work © HEB

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

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

7 How our Muscles Work © HEB

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

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

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

11 Our Achilles tendon in our heel
© HEB

12 How Arm Muscles Work © HEB Hinge joint

13 Muscles, bones and joints
© HEB Muscles, bones and joints

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

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

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

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

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

19 WHERE DO MUSCLES GET THEIR ENERGY FROM?
© HEB

20 Muscles get energy for contraction from R----------
------ ----- © HEB

21 Energy for Muscle Contraction
Glucose + Oxygen ----- © HEB

22 Energy for Muscle Contraction
+ CO2 + Water Glucose + Oxygen As the process uses oxygen, it is sometimes called aerobic respiration. © HEB

23 THE END © HEB

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