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October 23, 2026/Muscular System
Can You Crack Muscle Relaxation?
In a relaxed muscle, what happens to actin's myosin-binding sites? Tap to decide now!
What happens to the myosin-binding sites on actin filaments when a muscle is relaxed?
<p style="text-align:left;font-family:'Open Sans',arial,helvetica,sans-serif;font-size:16px;color:#000000;margin:0 0 12px;"><input type="radio" name="ans" value="no" />&nbsp;They are exposed to allow for muscle contraction.</p><hr /> <p style="text-align:left;font-family:'Open Sans',arial,helvetica,sans-serif;font-size:16px;color:#000000;margin:0 0 12px;"><input type="radio" name="ans" value="no" />&nbsp;They bind to calcium ions.</p><hr /> <p style="text-align:left;font-family:'Open Sans',arial,helvetica,sans-serif;font-size:16px;color:#000000;margin:0 0 12px;"><input type="radio" name="ans" value="no" />&nbsp;They form cross-bridges with myosin.</p><hr /> <p style="text-align:left;font-family:'Open Sans',arial,helvetica,sans-serif;font-size:16px;color:#000000;margin:0 0 12px;"><input type="radio" name="ans" value="no" />&nbsp;They are covered by tropomyosin.</p>
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23 October 2026 · 15:00 UTC