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13 Cards in this Set
- Front
- Back
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Muscles
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The organs of the muscle system
Comprise 40-50% of total body weight |
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Muscle Fibers Contraction
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A shortening and thickening of muscle fibers
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Function of Muscles
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Movement
Maintain posture Stabilize joints Generate heat |
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Skeletal Muscle Tissue
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Fibers are multinucleated, long and cylindrical
Cells contain striations Locations: upper and lower extremities Chest and abdomen, back, face Pharynx, larynx Diaphragm |
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Skeletal Muscle Tissue Functions
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Movement of upper and lower extremities
Movement of the chest Compress abdominal movements and maintain posture Facial expression Swallowing, talking, and breathing |
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Control of Skeletal Muscle
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Motorneuron in spinal cord
Axon from motorneuron stimulates muscle fiber to contract Contraction is voluntary |
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Cardiac Muscle Tissue
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Cells are branched
Intercalated discs at end-to-end contact points Cells contain striations and numerous mitochondria Location: heart Function: contraction of the heart |
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Control of Cardiac Muscle
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The Autonomic Nervous System (ANS) :
Sympathetic division Parasympathetic division Contraction is involuntary |
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Smooth Muscle Tissue
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Cells are fusiform (spindle shape)
No striation Single nucleus Location: Hollow organs Walls of vessels Functions: visceral movement |
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Control of Smooth Muscle
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The Autonomic Nervous System (ANS):
Sympathetic division Parasympathetic division Contraction is involuntary |
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Characteristics of Muscle Tissue
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Excitability: responsiveness to electrical stimuli
Conductivity: ability to transmit electrical impulses Contractility: ability to contract and generate force Extensibility: ability to extend fiber length Elasticity: ability to recoil back to original length |
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Anatomy of a Skeletal Muscle
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See Pic
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Muscle Components
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Whole muscle>> muscle fascicle >>muscle fiber>> myofibrils >>filaments
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