How a Muscle Contracts · Muscles
Calcium uncovers the grip sites — no calcium, no contraction.
At rest, the actin ropes are covered. The myosin arms are ready and willing, but every grip site is blocked — like a climbing wall with tape over all the holds. Calcium is what pulls the tape off.
There's more: calcium uncovers the grip sites — no calcium, no contraction. The full explanation — and the interactive version you can tap and quiz yourself on — lives in the app.
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