Notes in NAS VI (Motor unit)

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Published	11/11/2024	The {{c1::motor system}} is constituent of the tissues in the body that {{c2::set muscle tone of the body}} and bring about {{c2::voluntary …
Published	11/11/2024	The {{c1::motor neurones}} are the neurones that send out impulses to {{c2::effectors/muscles}}.
Published	11/11/2024	Motor impulses are initiated by the {{c1::brain}}, specifically in the {{c1::precentral gyrus}}, where the {{c1::primary motor cortex}} is l…
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Published	11/11/2024	A {{c2::motor unit}} consists of {{c1::a lower motor neurone}} and {{c1::the muscle fibres}} that it stimulates.
Published	11/11/2024	{{c1::Motor units}} are the minimal functional unit of the motor system.
Published	11/11/2024	The axon of a single lower motor neurone can branch out to attach to multiple muscle fibres and this can range from {{c2::many}} fibres ({{c1::low}} p…
Published	11/11/2024	The axon of the lower motor neurone attaches to muscle fibres at the {{c1::neuromuscular junction}}/{{c1::NMJ}}.
Published	11/11/2024	There are 3 types of motor units: {{c1::slow}} and {{c1::fast}}, which is further subdivided into {{c1::fast fatigue}} and {{c1::fast fatigu…
Published	11/11/2024	Fast motor neurones are {{c1::larger}} in size than slow motor neurons.
Published	11/11/2024	Slow motor units have a {{c1::rich blood}} supply and so rely on {{c1::aerobic}} respiration, as well being very resistant to {{c1::fatigue}…
Published	11/11/2024	Fast fatigue-resistant have a {{c1::weaker blood supply}} and so rely more on {{c1::anaerobic}} respiration but can only sustain {{c1::activ…
Published	11/11/2024	{{c1::Reflexes}} are {{c2::involuntary}}, {{c2::quick }} actions that occurs as a result of {{c2::stretching of a muscle reflex arc}}.
Published	11/11/2024	The reflex arc consists of an {{c1::afferent limb}}, {{c1::central component}} and an {{c1::efferent limb}}.
Published	11/11/2024	The importance of the skeletal muscle is for {{c1::movement}}, {{c1::posture}}, {{c1::heat generation}} and {{c1::stability of joints}}.
Published	11/11/2024	The enveloping connective tissue sheath is known as the {{c1::endomysium }}
Published	11/11/2024	A single cell of muscle is known as a {{c1::myocyte}}, which collect to form a {{c1::fascicle}}, which collect to form the muscle as we know…
Published	11/11/2024	The enveloping tissue sheath enveloping a fascicle is known as the {{c1::perimysium}}.
Published	11/11/2024	The tissue sheath enveloping all fascicles of the muscle is known as the {{c1::epimysium}}.
Published	11/11/2024	{{c1::Tendons}} are an {{c2::organised}}, {{c2::tough}} band of {{c2::fibrous connective tissue}} mass that form a {{c2::point of contraction}}.
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Published	11/11/2024	Myocytes are made from {{c1::myofibrils}}.
Published	11/11/2024	{{c1::Myofibrils}} are {{c2::long}}, {{c2::contractile}} {{c2::fibres}} composed of {{c2::thick}} and {{c2::thin}} {{c2::myofilaments}} that run {{c2:…
Published	11/11/2024	Myofibril contract under the {{c1::sliding filament}} model.
Published	11/11/2024	The two main filaments in the myofibril are {{c1::actin}} and {{c1::myosin}}, with the {{c1::myosin}} being the thicker of the two, and movi…
Published	11/11/2024	Tropomyosin {{c1::stops the actin from being moved by myosin}} at muscle rest.
Published	11/11/2024	{{c1::A-band}} is {{c2::where both myosin and actin overlap}}.
Published	11/11/2024	{{c1::I-band}} is the area {{c1::where only actin is present}}.
Published	11/11/2024	{{c1::H-zone}} is {{c2::the area where only myosin is present}}.
Published	11/11/2024	{{c1::Z-line}} is {{c2::one end of the sarcomere}}.
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