54.下列何種鈣離子通道（calcium channel）是所有肌細胞皆具有的，並負責釋出鈣離子啟動收縮？
(A)肌漿網膜上ryanodine receptor
(B)肌細胞膜上ligand-gated Ca2+ channel
(C)肌漿網膜上dihydropyridine receptor
(D)肌細胞膜上L-type Ca2+ channel

答案：登入後查看
統計： A(416), B(92), C(72), D(115), E(0) #1740735

詳解 (共 5 筆)

#2607657
有多種ryanodine 受體亞型：Ry...
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#4053132
通通都有肌漿網SR


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#6472527
【補充不同肌肉收縮機制】1. 骨骼肌動作...
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#6517694
68653ddb39c27.jpg
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#6532336
這題應該沒答案

? Example: Mesenteric artery smooth muscle

  • Stimulated by depolarization or agonists (like norepinephrine)

  • Contraction is entirely dependent on extracellular Ca²⁺

  • RyR-dependent SR calcium release is not essential

? Reference:

  • Sanders, K. M., Ward, S. M., & Koh, S. D. (2014). "Interstitial cells: regulators of smooth muscle function." Physiol Rev, 94(3), 859–907.

  • "Smooth muscle can function without a significant contribution of SR calcium stores" (textbook of Medical Physiology, Guyton & Hall)

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