Accepted at 1:39 a.m. Nov, 01, 2023 by Cameron
Author: ChamCham
Related Note: 1497374668330
Rationale for change

@Bilal I am appealing my prior suggestion as it was incorrectly rejected. You can refer to FA2023 p459 to review the crossbridge cycle, which plainly states that the phosphate is not released until myosin is bound to actin, and that initiates the power stroke (see steps 5 and 6). The original note's statement that myosin binds actin AFTER the phosphate is released is factually incorrect. I have copied my original suggestion below.

This card may be poorly worded. In the cycle for muscle contraction, the myosin head is cocked by hydrolysis of ATP. Then, myosin-actin binding is induced by conformational changes in troponin and tropomysin (which is triggered by calcium influx). It is the dissociation of phosphate from the myosin head that leads to the power stroke. Source: https://www.amboss.com/us/knowledge/Muscle_tissue#Z37fa9731777fdf6b49620fbc5edef410 - "Crossbridge cycling"

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