Thursday 30 April 2020
Discuss the structure and functions of the various muscle tissues found in humans
Smooth/Visceral Muscle; consists of
spindle-shaped cells; made up of long filaments or myofibrils; the cells lack
cross striations and sarcolemma; they are uninucleate/with one cell; they
contract and fatigue slowly; to bring about contraction and relaxation of the walls
of blood vessels, urino-genital tract and the gut; which aids in blood flow,
urine and sperm flow and peristalsis of food respectively; Skeletal/Striated
muscles; made up of long cylindrical cells; with long myofibrils running
parallel to each other; the cells have cross striations/stripes; are
multinucleated; they form bundles of long fibres attached to bones by tendons;
they contract and fatigue rapidly; to bring about movement of bones; (on the
body) they contain contractile protein myosin and actin; Cardiac/Heart muscle;
this is the muscle of the heart; is made up of short cylindrical cells; with
parallel myofibrils; the ends of each all are thickened into intercalated
discs; that connect adjacent cells; the myofibrils have cross striations; each
cell is uninucleate; the myofibrils contract without fatigue;
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