48.關於骨骼肌纖維的橫橋週期(cross-bridge cycle)敘述,下列..-阿摩線上測驗
4F
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5F 面試倒楣鬼-22幸運上後西 大二上 (2024/07/12)
1.緊密結合(45度)
2.ATP結合myosin,使之分離
3.水解ATP->ADP+Pi,但仍在myosin上 (角度變化 )
4.重新結合(90度)
5.脫去Pi並引起收縮(45度)
6.脫去ADP,
->1重複
(56->1)似乎在其他人的回答圖算在同個步驟 |
6F 宗翰 大三下 (2024/07/13)
出自: Human Anatomy and Physiology THIRD EDITION p.256、258
(A) 當肌纖維舒張時,橫橋仍與細肌絲(thin filament)緊密接合: 尚未接合
4."Cocking" of the myosin head. .....The myosin head is in its high-energy configuration, ready to take another "step" and attach to an actin site farther along the thin filament.
(B) 當橫橋產生強力滑動(power stroke)時,肌凝蛋白(myosin)釋放出ADP
2.Power stroke. .......At the same time, ADP and inorganic phosphate (Pi) generated during the prior contraction cycle are released from the myosin head.
(C) 當細胞質中鈣離子濃度增加,可促使橫橋與肌動蛋白(a... 查看完整內容 |