Question

what is the most special properties muscles fibre
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Answer 1

Excitability

For a muscle to contract and do work, its cells must be stimulated, most often by the nerves supplying them. Nervous impulses cause the release of the neurotransmitter acetylcholine at the nerve-muscle junction, and the acetylcholine activates receptors on the surface of the muscle cell. This results in an influx of positively charged sodium ions into the muscle cell and a depolarization of the muscle cell membrane, which in the resting state is quite negatively charged. If the membrane becomes sufficiently depolarized, an action potential results; the muscle cell is then "excited" from an electrochemical standpoint.

Contractility

In the case of skeletal muscles, muscle cells contract when stimulated by neural input; smooth and cardiac muscles do not require this input. When a muscle cell is excited, the impulse travels along various membranes of the cell to its interior, where it leads to the opening of calcium channels. Calcium ions flow toward and bind to a protein molecule called troponin, leading to sequential changes in shape and position of the associated proteins tropomyosin, myosin and actin. The upshot is that myosin binds to small strands within the cell called myofilaments and pulls them along, causing the cell to shorten, or contract. Since this is going on simultaneously and in a coordinated fashion in many thousands of myocytes at the same time, the muscle as a whole contracts.

Answer 2

protein cells

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