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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
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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 Walls of hollow visceral organs Involuntary Peristalsis visceral, nonstriated, involuntary Smooth Muscle
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
Muscle Characteristics #1 Excitability or Irritability • Ability to receive and respond to a stimulus.
#2 Contractility - Ability to shorten forcibly when stimulated
#3 Extensibility • Ability to stretch or extend
#4 Elasticity Ability to resume resting length after being stretched