**Please answer everything and don\'t write in cursive, high rating will be give
ID: 261048 • Letter: #
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**Please answer everything and don't write in cursive, high rating will be given out**
Ions:
2. Fill in the blanks in the paragraph below with the correct ion to describe how a muscle fiber contracts. (5 points) When a motor neuron triggers a muscle fiber to contract, ion is released from the This ion binds to the which on the actin pushes the tropomyosin aside, exposing the filaments. If causing a change in shape (the high-energy configuration). This myosin head then forms a is present, it will bind to a myosin head and release energy, with the actin filament. and are released, ), which and the myosin head returns to its normal shape makes the actin filament slide with respect to the events happening along the muscle fiber, an overall muscle contraction is achieved. filament. With many of theseExplanation / Answer
When a motor neuron triggers a muscle fibre to contract, Ca+2ion is released from the sarcoplasmic reticulum. This ion binds to the Troponin which pushes the tropomyosin aside, exposing the binding site on the actin filament. If __________is present it will bind to a myosin head and release energy, causing a change in shape. The myosin head then forms a cross bridge with the actin filament. ____ADP______ and _____Pi________are released, and the myosin head returns to its normal shape (low energy configuration_) which makes the actin filament slide with respect to the myosin filament.
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