The level of structural organization that actin and myosin in a sarcomere of a muscle fiber represent is tissue. It is the level of organization of cells.
A tissue can be defined as a group of specialized types of cells that perform one or more specific functions.
Different tissues can organize into groups that perform specific functions which are called organs.
Actin and myosin are two specific proteins present in muscle cells, which are involved in muscle contraction.
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