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refers to geographic, residential, and other forms of spatial closeness.
Actin Myofilaments
Thin filaments in muscle cells that, along with myosin filaments, contribute to muscle contraction.
I Band
Area between the ends of two adjacent myosin myofilaments within a myofibril; Z disk divides the I band into two equal parts.
M Line
Line in the center of the H zone made of delicate filaments that holds the myosin myofilaments in place in the sarcomere of muscle fibers.
Myosin Head
The globular part of the myosin protein that binds to actin filaments in muscle cells during contraction.
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