SEHS Topic 1.2 The Muscular System
Outline the general characteristics
common to muscle tissue
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Contractility
Extensibility
Elasticity
Atrophy
Hypertrophy
Control by nerves
Serviced by capillaries
Cont’d
• Contactility - the ability of muscle tissue to
contract (when its thick (myosin) and thin (actin)
filaments slide past each other)
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.
cont’d Atrophy and Hypertrophy
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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.
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
Cont’d –Nerve connection & capillaries
Distinguish between the different
types of muscle
• 1. Smooth; 2. Cardiac; 3. Skeletal
Annotate the structure of skeletal muscle
• Limit to epimysium, perimysium, endomysium,
muscle fibers, myofibril, sarcomere, actin and
myosin
Labeled
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
Identify skeletal muscle from the
Anterior part of the body
• Must include:
• Deltoid, pectoralis, illiopsoas, sartorius,
quadraceps femoris (rectus femoris, vastus
intermedialis, vastus medialis, vastus lateralis),
tibialis anterior, abdominus rectus, external
obliques and biceps brachii
Identify the location of skeletal muscle
form the Posterior region of the body
• Must include:
• Trapezius, triceps brachii, latissimus dorsi,
gluteus maximus, hamstrings (biceps femoris,
semitendinosus, semimebranosus),
gastrocnemius, sloeus, erector spinae