actin one of the proteins into which actomyosin can be split can exist in either a globular or a fibrous form actomyosin a protein complex in muscle fibers composed of myosin and actin shortens when stimulated and causes muscle contractions
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Quick Answer. The cellular level is the level of cells, the most basic structural units of the human body. Just like a house is made of many individual bricks sealed together by cement, the human body is comprised of millions of cells that combine to form tissues, organs and whole organisms. Continue Reading.