A discussion of microscopic muscle contraction should include all activities, chemicals and structures involved in muscle contraction....

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Medical Sciences

A discussion of microscopic muscle contraction should includeall activities, chemicals and structures involved in musclecontraction. So a discussion of the depolarization of thesarcolemma, the role of the ACH receptor, sodium and potassium ingenerating an action potential as well as the role of calcium, Ttubules, the sarcoplasmic reticulum and tropomycin is expected. Youshould describe the myofilaments and the process of the slidingfilaments. A discussion of the contraction of a whole muscle shouldinclude the macroscopic structures of a muscle and the motor endplates, connective tissue covering and the relationships betweenthese structures.

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The skeletal muscle contract only when stimulated by somaticmotor unitThis can cause muscle fibre to contract One somaticmotor neurone can innervate 31000 muscle FibresThe unit of nerve fibre and muscle fibre is called a motorunitThe muscle contain many muscle fibre units called fasciclesWithin a motor unit that assist the contraction of muscle there isaxon terminal of motor neurone The end bulb of axon of the motorneurone have some vesicles These vesicles contain neurotransmittercalled acetylcholine The muscle fibre contain many myofibrilsWithin the muscle fibre there is mitochondria which can provideATPThere are many nucleus around the muscle fibre because themuscle fibre is multinucleated The muscle fibre has a membranecalled sarcolemma which contains many receptors and Ion channelsMyofibrils contain thin and thick filaments The portion betweenone z line and adjacent z line is called a See Answer

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