Microfilaments, which are the thinnest among the cytoskeletal elements, support the cellular shape and all of its internal parts via absorbing tension.
They function in cellular movement, have a diameter of about 7 nm, and are made of two intertwined strands of a globular protein called actin. For this reason, microfilaments are also known as actin filaments.
MCAT Official Prep (AAMC)
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• Microfilaments assist with cell movement and structure and are made of a protein called actin. Their main role is to absorb tension.
• Actin works with another protein called myosin to produce muscle movements and cell division, and cytoplasmic streaming in plants.
Cytoskeleton: network of protein fibers that help with cellular movement and maintaining its structure/shape
Actin: a globular structural protein that polymerizes in a helical fashion to form an actin filament (or microfilament)
Myosin: a large family of motor proteins found in eukaryotic tissues, allowing mobility in muscles
Microfilaments: thin protein fibers made up of actin proteins; their fundamental role is to absorb tension.