Movement Chapter 30.

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Presentation transcript:

Movement Chapter 30

What you need to know! How skeletal muscle contracts. Cellular events that lead to muscle contraction.

Skeletal Muscle Attached to bones by tendons and responsible for the movement of bones Each long fiber is a single muscle cell Each muscle fiber is a bundle of myofibrils which are made of thin filaments (actin) and thick filaments (myosin)

Sarcomere Smallest unit of contraction Z lines mark the borders of sarcomeres M line is the center of the sarcomere Sarcomeres contract when stimulated The sliding-filament model states that the actin (thin filaments) slide toward the M line so that they overlap the myosin (thick filaments) more during a contraction

Motor Neuron  Muscle Motor units are made of neurons and the muscle fibers they control The area where the axon of the neuron contacts the muscle fibers is the neuromuscular junction Action potentials release acetylcholine which stimulate the muscle fibers to contract https://www.youtube.com/watch?v=BMT4PtXRCVA

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