Movement
- Created by: lavithedemon
- Created on: 15-04-16 08:04
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- Movement
- bones and exoskeletons anchor muscles and act as levers
- movement of the body requires muscles to work in antagonistic pairs
- synovial joints allow certain movements but not others
- hinge joints
- flexion
- extension
- ball and socket joints
- wider range of movements
- hinge joints
- skeletal muscle fibres are multinucleate and contain specialised endoplasmic reticulum
- plasma membrane - sarcolemma
- endoplasmic reticulum - sarcoplasmic reticulum
- myofibril
- muscle fibres contain many myofibrils
- they have alternating light and dark bands
- Z - line
- Each myofibril is made up of contractile sarcomeres
- sarcomere is between 2 z-lines
- thin actin filaments
- thick myosin filaments
- the contraction of the skeletal muscle is achieved by the sliding of actin and myosin filaments
- creation of cross bridges with heads of myosin
- calcium ions and the proteins tropomyosin and troponin control muscle contraction
- calcium ions make the actin's binding sites exposed and the myosin head to bind (cross - bridges)
- ATP binds to the myosin and makes them detach
- ADP P makes myosin heads change their angle
- ADP and P released and the heads attach to a different spot + push the actin filaments inwards (power stroke)
- ADP P makes myosin heads change their angle
- ATP binds to the myosin and makes them detach
- calcium ions make the actin's binding sites exposed and the myosin head to bind (cross - bridges)
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