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Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
Muscle physiology
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Muscle physiology

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Published in: Health & Medicine, Technology
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Transcript

  • 1. Table 12-3: Comparison of Three Muscle Types
  • 2. Smooth Muscles: Contrasted to Skeletal Muscle • Homeostatic role – Control fluid – Sphincters • Tonic contractions – Support tubes – Move products • Slow contractions – Little fatigue – Low O2 use
  • 3. Smooth Muscles: Contrasted to Skeletal Muscle Figure 12-25a: Types of smooth muscle
  • 4. • Stimulation – Electrically coupled – Hormones – Paracrines – Various receptors – Single Unit – Multiple unit • Single tapered cells • Longer actin & myosin Smooth Muscles: Characteristics
  • 5. Smooth Muscle Contraction: Mechanism Figure 12-28: Smooth muscle contraction
  • 6. Smooth Muscle Relaxation: Mechanism Figure 12-29: Relaxation in smooth muscle
  • 7. Cardiac Muscle: Contrasted to Skeletal • Short branched fibers • Single nucleus • Intercalated discs • Gap junctions • Stimulation – Pacemaker – Autonomic • Hormonal
  • 8. Cardiac Muscle: Contrasted to Skeletal Figure 14-7h: ANATOMY SUMMARY: The Heart
  • 9. Action Potentials
  • 10. • Smooth muscle cells are linked electrically via gap junctions so they can stimulate each other causing a wave like action potential • This is also referred to as a FUNCTIONAL SYNCYTIUM

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