Muscle Structure
Skeletal muscle is made up of thousands of cylindrical muscle fibres. the fibres are bound together by connect tissues through which run blood vessels and nerves.
Each muscle fibre contains
- numerous thread-like myofibrils that are arranged like a telephone cable and run the entire length of the fibre
- many mitochondria
- an extensive network of interconnecting tubes call sarcoplasmic reticulum
- many nuclei
Key terms
Sketetal muscle -the muscle that cause our bodies to move
Myofibril - part of muscle fibre, contains sarcomeres and the contractile proteins actin and myosin
Sarcoplasmic Reticulum- equivalent to the endoplasmic reticlum of cells. it forms a network of channels that spread out over the surface of the myofibril and acts as a store of calcium ions that when released initiate muscle contraction
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