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Cards In This Set
| Front | Back |
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Functions of muscle
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- Movement
- Body support and maintence of Posture - Production of heat |
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Properties of muscle
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Contraction (shorten and elongate)
excitation (ability to respond to a stimulus) extension (elongate) elasticity (return back to normal) |
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Sarcoplasm
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Living material within a muscle cell
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Sarcolemma
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cell membrane of a muscle cell
has invaginations called T Tubules |
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Sarcoplasmic reticulum
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Produces contractile fibers
Myosin (thick) and Actin (thin) Troponin and Tropomyosin are associated with Actin |
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Sarcomere
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Functional unit of a muscle cell (Z line)
*muscle contraction takes place in the sarcomere* calcium leaves the terminal cisternae and goes into sarcomere |
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Myofibril
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Muscle cell
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Skeletal Muscle
Smooth Muscle Cardia Muscle |
Skeletal - striated, voluntary (needs stimulus), attached to skeleton
Smooth - no striations, involuntary. (digestive tract) main function is Peristalsis Cardiac - striated, involuntary. only found in the heart |
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Fascicles **
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Bundles of individual muscle cells
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Fascia
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Membrane that covers muscle
an extension of the tendon |
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Endomysium
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Surround individual myofibril (muscle fiber)
- only surrounds ONE - separates each muscle cell from eachother |
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Perimysium
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Membrane around fascicle (around the Bundle)
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Epimysium
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Surrounds the Entire Muscle
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T Tubules
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Invaginations in the sarcolemma
(calcium rest in these invaginations) |
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Terminal Cisternae
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Extensions of T Tubules
Calcium is stored here in resting muscles calcium initates muscle contraction |
