Question

select the single word into each sentence to make it correct to describe the process of contraction of a sarcomere. 1. the step in which the muscle fiber develops tension and may shorten is called click to select. it begins after the active site on actin is exposed. 2. the myosin head must have an click to select molecule bound to it to initiate the process. 3. the head extends toward the exposed click to select site on the thin filament. 4. a click to select is formed by the attachment of the myosin head to the thin filament. 5. the myosin head pushes forward, moving the thin filament toward the m - line. this is called the click to select stroke. 6. once more atp binds, myosin will release from the actin and hydrolyze another atp. this is called the click to select stroke. atp active calcium complex contraction cross - bridge power recovery relaxation

Explanation:

1. Muscle fiber developing tension and possibly shortening after actin - active site exposure is contraction.
2. Myosin head needs ATP to initiate the process.
3. Myosin head extends towards the exposed active site on thin - filament.
4. Attachment of myosin head to thin - filament forms a cross - bridge.
5. Myosin head pushing thin - filament towards M - line is the power stroke.
6. When more ATP binds and myosin releases from actin and hydrolyzes ATP, it's the recovery stroke.

Answer:

1. contraction
2. ATP
3. active
4. cross - bridge
5. power
6. recovery