Order the cross-bridge cycle

Exercise and reference answers

Steps

1. Ca2+ binds troponin, exposing the myosin-binding site
2. Myosin head attaches to actin, forming a cross-bridge
3. Power stroke pulls the thin filament toward the M-line
4. A new ATP molecule binds the myosin head, causing detachment
5. ATP hydrolysis re-cocks the myosin head for another cycle

Instructions

Tap the steps in the order they happen during a single cross-bridge cycle.