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1. Key unit of contraction composed of bundled parallel protein myofilaments 2. This part of muscle cell transmits AP.
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1. Key unit of contraction composed of bundled parallel protein myofilaments

2. This part of muscle cell transmits AP.

User Gutompf
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Answer:

i am not sure but i think you talk about myosin it is bind with ATP to do the contraction with actin

User Tarun Behal
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