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SEHS Topic 1.2 The Muscular System

SEHS Topic 1.2 The Muscular System. Outline the general characteristics common to muscle tissue. Contractility Extensibility Elasticity Atrophy Hypertrophy Control by nerves Serviced by capillaries. Cont’d.

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SEHS Topic 1.2 The Muscular System

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  1. SEHS Topic 1.2 The Muscular System

  2. Outline the general characteristics common to muscle tissue • Contractility • Extensibility • Elasticity • Atrophy • Hypertrophy • Control by nerves • Serviced by capillaries

  3. Cont’d • Contactility - the ability of muscle tissue to contract (when its thick (myosin) and thin (actin) filaments slide past each other)

  4. Cont’d • Extensibility - Muscle extensibility refers to the ability of a muscle group to lengthen. This involves both contractile muscle and ligaments. • Elasticity - refers to the ability of your muscle and joints to stretch and contract in different directions while retaining their normal length and tension at rest.

  5. cont’d Atrophy and Hypertrophy Muscular atrophy means that muscle that was there has degenerated. - It can happen because of disuse (like if you have a broken bone that's in a cast for a period of time) or because innervation to that muscle has been interrupted (as with a spinal cord injury), or any other reason that it isn't being used.

  6. Cont’d • Hypertrophy – A nontumorous enlargement of an organ or a tissue as a result of an increase in the size rather than the number of constituent cells

  7. Cont’d –Nerve connection & capillaries

  8. Distinguish between the different types of muscle • 1. Smooth; 2. Cardiac; 3. Skeletal

  9. Annotate the structure of skeletal muscle • Limit to epimysium, perimysium, endomysium, muscle fibers, myofibril, sarcomere, actin and myosin

  10. Labeled

  11. Define the terms origin and insertion of muscles • Origin – the attachment of a muscle tendon to a stationary bone • Insertion – the attachment of a muscle tendon to a moveable bone

  12. Identify skeletal muscle from the Anterior part of the body • Must include: • Deltoid, pectoralis, illiopsoas, sartorius, quadracepsfemoris(rectus femoris, vastusintermedialis, vastusmedialis, vastuslateralis), tibialis anterior, abdominus rectus, external obliques and biceps brachii

  13. Identify the location of skeletal muscle form the Posterior region of the body • Must include: • Trapezius, triceps brachii, latissimusdorsi, gluteus maximus, hamstrings (biceps femoris, semitendinosus, semimebranosus), gastrocnemius, sloeus, erector spinae

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