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Questions and Answers
What is the primary structure of microfilaments?
What role do microfilaments play in muscle cells?
What is the diameter of microfilaments?
What is the primary function of the cortex formed by microfilaments?
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What is myosin's role in relation to microfilaments?
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Study Notes
Microfilaments (Actin Filaments)
- Solid rods measuring approximately 7 nm in diameter, formed by a twisted double chain of actin subunits.
- Serve a critical role in bearing tension and resisting pulling forces within the cell, contributing to cellular stability.
- Form a three-dimensional network known as the cortex, which helps maintain cell shape and structure.
- Constitute the core of microvilli in intestinal cells, enhancing surface area for absorption.
- Myosin proteins interact with microfilaments, facilitating cellular motility and movement.
- In muscle cells, actin filaments are arranged in parallel, allowing for efficient contraction and force generation.
- Thicker myosin filaments work in conjunction with the thinner actin fibers to produce movement and muscle contraction.
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Description
Explore the essential role of microfilaments, or actin filaments, in cellular structure and function. This quiz covers their significance in tension-bearing, movement, and the structure of microvilli. Learn how actin interacts with myosin to facilitate muscle contraction and cellular motility.
