Muscle and Movement
Understandings:
- Skeletal muscle fibres are multinucleate and contain specialized endoplasmic reticulum.
- Muscle fibres contain many myofibrils.
- Each myofibril is made up of contractile sarcomeres.
- The contraction of the skeletal muscle is achieved by the sliding of actin and myosin filaments.
- ATP hydrolysis and cross bridge formation are necessary for the filaments to slide.
- Calcium ions and the proteins tropomyosin and troponin control muscle contractions
Skill: Drawing labelled diagrams of the structure of a sarcomere.
Drawing labelled diagrams of the structure of a sarcomere should include Z lines, actin filaments, myosin filaments with heads, and the resultant light and dark bands.
Drawing labelled diagrams of the structure of a sarcomere should include Z lines, actin filaments, myosin filaments with heads, and the resultant light and dark bands.
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Aims:
Aim 7: Use of grip strength data loggers to assess muscle fatigue.
Aim 7: Use of animations to visualize contraction.
Guidance:
Measurement of the length of sarcomeres will require calibration of the eyepiece scale of the microscope.