Part 3 · Nerve and Muscle Physiology
Same concept, other depth: Foundation →
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Smooth muscle lacks sarcomeres and troponin; actin (anchored to dense bodies and dense plaques) greatly outnumbers myosin. Ca²⁺ rises from L‑type Ca²⁺ channels (electromechanical coupling) and from SR via IP₃ receptors after GPCR–Gq activation (pharmacomechanical coupling, which can occur without a change in Vm).
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