Which is required for cross‑bridge detachment during muscle contraction?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for the Ivy Tech APHY 101 Muscle System Test. Dive into comprehensive questions with clear hints and explanations, boosting your confidence for the exam!

Multiple Choice

Which is required for cross‑bridge detachment during muscle contraction?

Explanation:
Detachment of the myosin head from actin requires ATP binding. When ATP binds to the myosin head, its affinity for actin drops and the cross-bridge releases. After detachment, ATP is hydrolyzed to ADP and Pi, which re-energizes the head for another cycle. Calcium is needed to expose actin’s binding sites so cross-bridges can form, and acetylcholine at the neuromuscular junction triggers the contraction signal, but the actual release of the cross-bridge hinges on ATP binding. Myosin is the motor protein that does the binding and power stroke, and without ATP the cross-bridges would remain attached (rigor).

Detachment of the myosin head from actin requires ATP binding. When ATP binds to the myosin head, its affinity for actin drops and the cross-bridge releases. After detachment, ATP is hydrolyzed to ADP and Pi, which re-energizes the head for another cycle. Calcium is needed to expose actin’s binding sites so cross-bridges can form, and acetylcholine at the neuromuscular junction triggers the contraction signal, but the actual release of the cross-bridge hinges on ATP binding. Myosin is the motor protein that does the binding and power stroke, and without ATP the cross-bridges would remain attached (rigor).

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy