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Myofibrils are composed primarily of two protein filaments called?
thick filaments and thin filaments
Is it true that thick filaments are made of a protein called actin?
false, it's made of myosin
Actin makes up cytoskeleton fibers called?
The actin that makes up cytoskeleton fibers are called microfilaments. They are the thinnest filaments of the cytoskeleton a structure found in the cytoplasm of eukaryotic cells.Ê
What is voluntary muscle?
Involuntary muscles are muscles that are not controllable consciously, and instead contract due to unconscious impulses sent by the autonomic nervous system or certain specialized cells or hormones. Both smooth muscle and cardiac muscle can be classified as involuntary muscles. Smooth muscle is comprised of spindle-shaped cells that have no striations and is found in numerous locations throughout the human body. Cardiac muscle is striated rather than smooth, and is found only within the walls of the heart. Smooth muscles are involuntary muscles composed of thick and thin protein filaments that are homologous to the organelles known as myofibrils found in skeletal muscles. The thin filaments are composed of a globular protein called actin, while the thick ones are made up of a motor protein called myosin. Smooth muscles require extracellular calcium ions to contract: the ions activate a nucleotide called Adenosine triphosphate (ATP), which then activates the myosin filaments. The myosin filaments attach to the actin filaments in a process known as the crossbridge cycle, which causes the thick and thin filaments to slide over each other and contract. When the myosin filaments release the actin filaments, the muscle relaxes.
In a eukaryotic cell a network of protein filaments called help maintain the shape of the cell?
B - the cytoskeleton
What Microfilaments are made from ball shaped proteins called?
Microfilaments are made from a protein called actin. Actin filaments are composed of monomers of globular actin proteins, which can polymerize to form long, thin filaments that are a crucial component of the cytoskeleton in cells.
What protein filament is usually always ready for muscle contraction?
The structure of muscle filaments - View diagram of the structure of muscle ... These two types of filament have different structures that enable then to work together. ... Thick filaments are formed from a protein called myosin which has important ...muscle filaments cause muscles to contract,
What is composed of myosin?
Myosin is a protein found in muscle cells that plays a key role in muscle contraction. It consists of long molecules called myosin filaments, which interact with actin filaments to generate the force needed for muscle movement.
In a eukaryotic cell a network of protein filaments called what help maintain the shape of cell?
In a eukaryotic cell, a network of protein filaments called the cytoskeleton helps maintain the shape of the cell. The cytoskeleton also plays a role in cell division, intracellular transport, and cellular movement. It is composed of three main types of filaments: microfilaments, intermediate filaments, and microtubules.
What is it called when network of protein filaments and microtubules in cells that control the cells shape maintains organization and is involved in cell movement?
cytoskeleton
What is a network of protein fillaments that helps the cell maintain its shape?
The network of protein filaments that helps the cell maintain its shape is called the cytoskeleton. It is made up of three types of filaments: microfilaments (actin), intermediate filaments, and microtubules. The cytoskeleton provides structural support, helps in cell movement, and is involved in intracellular transport.
Cellular ropes made of repeating units of the protein actin?
These cellular ropes are called actin filaments. Actin is a globular protein that polymerizes to form these filaments, which are essential for various cellular processes such as cell movement, division, and shape maintenance. The highly dynamic nature of actin filaments allows cells to quickly reorganize their internal structure in response to external signals.
