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23 Cards in this Set
- Front
- Back
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Muscle Contraction
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Myofilaments called actin and myosin
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Sarcolemma
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muscle plasma membrane
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Sarcoplasm
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cytoplasm of a muscle cell
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Skeletal muscle tissue
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body motility
contracts fast stripes called striations voluntary |
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Cardiac Muscle Tissue
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only in the heart
not voluntary contracts steadily neural controls to respond to body needs |
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Smooth Muscle Tissue
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found in stomach, bladder, and passages
not striated and not voluntary channels food |
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Excitability
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receive and respond to stimuli
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Contractility
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shorten force
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Extensibility
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stretch or extend
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Elasticity
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recoil or normal length
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Muscle Function - Skeletal muscle
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locomotion
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Muscle Function - Smooth Muscle
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maintain blood pressure
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Muscle Function - Cardiac Muscle
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navigate blood through the body
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Skeletal Muscle - Connective Tissue
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Endomysium - surrounds single muscle fiber
Perimysium - surrounds groups of muscle fibers Epimysium - surrounds the entire muscle |
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Skeletal Muscle - Nerve and Blood Supply
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one nerve, one artery, and one or more veins
contracting needs ocygen and nutrients |
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Skeletal Muscle - Attachments
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contractions move the bone the toward the orgin
Directly - perosteum of the bone Indirectly - extend beyound the muscle as a tendon |
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Myofibrils
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rodlike elements
make most muscle volume |
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Sarcomeres
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smallest contractile unit
has myofilaments thick and thin |
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Myofilaments - Banding Pattern
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thick filaments - extend length of A band
thin filaments - extend across the I band and into the A band Z disc - sheet of proteins thin does not overlap thick |
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Sarcoplasic Reticulum (SR)
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surrounds myofibril and runs longitudinally
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Nerve Stimpulus of Skeletal Muscle
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active by motor neutons
axon tracel to muscle cells |
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Neuromuscular Junction
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has axonal endings (ACh)
plate of a muscle which help form NJ Synaptic cleft - how muscle fibers are separated |
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Destruction of Acetylcholine
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ACh gets smashed by Acetylcholinesterase
no more stimuli |
