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Summary Muscle and muscle tissue made easy for nurses
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An in-depth summary of the anatomy and physiology of the muscles as well as the muscle tissues.
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Muscle & Muscle TissueLearning Unit 18
Anatomy and physiology
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, Learning Unit 18 muscle & muscle tissue
Muscle tissue
a. Skeletal muscle tissue
• Longest muscle cells and have striations (stripes)
• This is normally a voluntary muscle (as its subject to voluntary control)
Characteristics:
• Overall body mobility
• Contracts rapidly
• Exerts tremendous power
• Adaptable
• Tires easily and must rest after short periods of activity
b. Cardiac muscle tissue
• Occurs only in the heart (bulk of heart walls)
• Muscle cells are striated
• Involuntary
Characteristics:
• Can contract without being stimulated by the nervous system
• Usually contract at a fairly steady rate set by the hearts peacemaker
c. Smooth muscles
• Found in walls of hallow visceral organs
• Consists of Elongated cells
• No striations
• Involuntary
Characteristics :
• Force fluids and other substances through internal body channels
• Forms valves to regulate the passages of these substances
• Dilates and constrict pupils
• Contractions are slow and sustained
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