Muscular system(idsn)
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Transcript of Muscular system(idsn)
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MUSCULAR SYSTEMTHE SYSTEM THAT ENABLES US TO MOVE, MAINTAINS OUR POSTURE AND HELPS IN HEAT PRODUCTION.
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DID YOU KNOW?
•The longest muscle is the SARTORIUS.
•The biggest muscle is the GLUTEUS MAXIMUS.
•The smallest muscle is the STAPEDIUS.
•Our body is composed of 640 muscles.
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FUNCTIONS OF THE MUSCLES
•Movement
•Heat production
•Posture
•protection
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CHARACTERISTICS OF MUSCLES
•Contractility – the ability of muscles to shorten
•Elasticity – the ability of muscles to go back to its original shape
•Excitability – the ability of muscles to respond to stimuli
•Extensibility – the ability of muscle to lengthen
•Sphincter – muscles that constrict openings
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CLASSIFICATION OF MUSCLES
FUNCTIONALLY
•Voluntary – can be moved at will
• Involuntary – can’t be moved intentionally
STRUCTURALLY
• Striated – have stripes across the fibers
• Smooth – no striations
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TYPES OF MUSCLES
•Cardiac muscles
•Skeletal muscle
•Visceral muscle
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SMOOTH MUSCLES
•Fibers are thin and spindle shaped.
•No striations
•Single nuclei
•Involuntary
•Contracts slowly
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CARDIAC MUSCLE
•Cells are branched and appear fused to one another
• Has striations
•Each cell has a central nucleus
• involuntary
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SKELETAL MUSCLES
•Fibers are long and cylindrical
•Multi-nucleated
•Striated
•voluntary
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Smooth muscle
Cardiac muscle
skeletal muscle
No striation Striated
Involuntary Voluntary
Esophagus, lungs,
stomach, intestine
Heart Biceps, triceps,
muscles that are attached
to bones
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ENUMERATION
•1-4. Give two (2) pairs of muscle movements.
•5-7. What are the three (3) kinds of muscle?
•8-10. Give three (3) functions of the muscular system.
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ASSIGNMENT
•What are the three (3)parts of a muscle?
•How many percent of our body is composed of muscle?