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© HEB MUSCLES AND MOVEMENT KS3 Biology By Dr H E Bloomfield
© HEB How our Muscles Work Muscles work by C-------ING (getting shorter and fatter) and pulling on bones.
© 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
© HEB How our Muscles Work
© HEB Two muscles working together in opposite directions are called A------------ muscles. How our Muscles Work
© HEB The BICEPS and TRICEPS in our arm are ANTAGONISTIC muscles. They work as a pair and in opposite directions. How our Muscles Work
© HEB How our Muscles Work
© HEB Bending our Arm BICEPS contracts and bends arm TRICEPS relaxes and is pulled longer
© HEB Straightening our Arm BICEPS relaxes and is pulled longer TRICEPS contracts and straightens arm
© HEB How our Muscles Work Muscles are attached to bones by strong non- stretchy TENDONS. muscle tendons
© HEB Our Achilles tendon in our heel
© HEB How Arm Muscles Work Hinge joint
© HEB Muscles, bones and joints
© HEB TAKING THE STRAIN How Strong are your Muscles?
© HEB 1.Put the scales on the bench. Push down with your fists as hard as you can. My result is __________ N
© 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
© HEB 3.Try squeezing the scales with your fingers. My result is __________ N
© HEB 4.Hold the scales between your two palms. Push them together as hard as you can. My result is __________ N
© HEB WHERE DO MUSCLES GET THEIR ENERGY FROM?
© HEB Muscles get energy for contraction from R---------- + --- + ----- ENERGY ------- + ------
© HEB Energy for Muscle Contraction + --- + ----- ENERGY Glucose + Oxygen
© HEB Energy for Muscle Contraction + CO 2 + Water ENERGY Glucose + Oxygen As the process uses oxygen, it is sometimes called aerobic respiration.
© HEB THE END
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