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Muscle

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Muscle. Overview. Myo- Mys- Sarco-. Striations Elongated cells Attach to cover the skeleton Power Voluntary  skeletal, striated, voluntary. Skeletal Muscle. Striated Branched Heart Involuntary Gap junctions  cardiac, striated, involuntary. Cardiac Muscle. No striations - PowerPoint PPT Presentation

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Muscle

OverviewMyo-Mys-

Sarco-

Skeletal Muscle

• Striations• Elongated cells

• Attach to cover the skeleton• Power• Voluntary

skeletal, striated, voluntary

Cardiac Muscle

• Striated• Branched

• Heart• Involuntary• Gap junctions

cardiac, striated, involuntary

Smooth Muscle• No striations

• Walls of hollow visceral organs• Involuntary• Peristalsis

visceral, nonstriated, involuntary

Muscle Functions

#1: Producing Movement

– Skeletal = locomotion and manipulation– Cardiac = movement of blood through heart.– Smooth = squeezes substances through

organ tracts.

Muscle Functions

#2 Maintaining Posture

Muscle Functions

#3 Stabilizing Joints

Muscle Functions

#4 Generating Heat

Page 10: Muscle

Muscle Characteristics

#1 Excitability or Irritability

– Ability to receive and respond to a stimulus.

Page 11: Muscle

#2 Contractility

- Ability to shorten forcibly when stimulated

Page 12: Muscle

#3 Extensibility– Ability to stretch or extend

Page 13: Muscle

#4 Elasticity

Ability to resume resting length after being stretched

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