1. When skeletal muscle is at rest (relaxed), _________________________ of actin

Question

1. When skeletal muscle is at rest (relaxed), _________________________ of actin filament is covered by ________________________. Thus, actin filament and myosin head are dissociated. At this stage, ____________ and ____________ are likely bound to myosin head (and the myosin head is waiting loosely and ready to attach to actin filament when the signal comes).

2. When the muscle contraction signal (increased concentration of ____________ ion) comes, _____________________ moves away from the _____________________ of actin filament, and the myosin head is allowed to bind to it.

3. When _______________ is released from the myosin head, it strengthens the binding between myosin head and actin filament and generates power stroke that moves actin filaments (myosin moves from ___________-end to ___________-end of the actin filament).

4. ________ will be then released from the myosin head.
5. ________ will bind to the myosin head, causing a release of myosin head from actin filament.

Explanation / Answer

2.C++

3.ADP, motor

4. phosphate

5. ATP

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