THE CYTOSKELETON
The cytoskeleton, which is made up of tiny filamentous proteins present in the cytoplasm, is the
framework of the cell. A cytoskeleton is present in all types of cells. The cytoskeleton is a web of
filaments and tubules that runs through the cytoplasm, the portion of the cell that contains
everything else save the nucleus. The cytoskeleton's general purpose is to support cell life, give it
structure, and control and connect organelles, a type of organ, within it.
The cell framework is a chain that provides cells their shape and strength, according to Maria
Floriana's description in her book Basic Biomedical Sciences for Health Students.
Microfilaments, and intermediate filaments are the three types of filaments that make up the
cytoskeleton. Several different protein connections bind the three filaments together. In this
manner, the filaments build a framework for the cell that encloses the cytoplasm. The position of
the nucleus within the cell will then be stronger as a result.
Filaments that make up the cytoskeleton
The cytoskeleton is made up of three filaments, each of which has unique properties.
Microtubules
Protein chains called microtubules are made up of globular tubules that create a hollow spiral
with a diameter of around 25 nm. A globular polypeptide makes up the tubulin molecule. Protein
molecules will be organized to form protofilaments if they transform into microtubules.
Protofilaments often create microtubules with 13 threads per inch, like a pipe. The largest of the
other two component fibers are microtubules. According to Drs. Wagino Sunarto and Eko
Susilowati's book Inheritance of Traits in Humans, Animals, and Plants, microtubules can also
create cytoplasmic organelles including centrioles, cilia, and flagella.
Actin filaments or microfilaments
Double strands of tiny, linked proteins make up microfilaments. Compared to microtubules,
which have a diameter of roughly 7 nm, these filaments are thinner.Since actin balls make up this
filament shape, these protein fibers are also known as actin filaments or actin fibers. A light
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microscope cannot view microfilaments. The use of an electron microscope is required to see and
study their constituent filaments.
In-between Filaments
Intermediate filaments are made up of chains of protein molecules that are fibrous. The thick,
twisted strands of molecular chains have a diameter of 8 to 10 nm. Although not all intermediate
filaments include vimentin protein, these filaments are made out of vimentin spheres. Because
they lie between microtubules and microfilaments in size, the cytoskeleton's filaments are known
as intermediate filaments.
Cytoskeleton Function
The cytoskeleton's primary job is to give the cell and other organelles in it a framework and
shape. Animal cells have a cytoskeleton to keep their shape, in contrast to plant cells, which have
a cell wall. The cell's primary purpose is to be mechanically supported, including by retaining its
shape. The cytoskeleton's constituent parts account for its remarkable strength and tenacity.
Numerous cellular organelles and cytosolic enzyme molecules have locations in this network.
The cytoskeleton is also involved in many types of cell motility or movement. The shifting of a
cell's position and movement are both referred to as motility. The cytoskeleton and motor
proteins must interact for the majority of these movements to occur. The cytoskeleton controls
the cell, aids in the movement of organelles inside the cell, and maintains the position of cell
organelles while they perform their activities. The cytoskeleton, for instance, aids in the
movement of chromosomes during cell division. The cytoskeleton's microfilaments are protein
fibers that resemble threads and have a diameter of 3-6 nanometers. (nm). Microfilaments are the
cytoskeleton's tiniest filaments as a result. Because they are mostly made of the protein actin,
which is also responsible for muscular contraction, microfilaments are also referred to as actin
filaments. As a result, muscle cells frequently include microfilaments.
Here are a few of the jobs that microfilaments perform:
The initial job of microfilaments is to help with cytokinesis, which is the division of a
cell's cytoplasm into two daughter cells.
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The ability of animals with a single cell, such amoebas, to move is made possible by
microfilaments since they help with cell motility (movement).
Last but not least, microfilaments play a role in the movement of cytoplasm throughout.
The cytoskeleton serves to give the cell a specific shape, provide support, and maintain
the building structure in place. It is comparable to the framework of a building.
According to the book How to Quickly Master Biology by the Creative Team, the cytoskeleton
also serves a number of additional purposes in the body, like :
a) as a cytoplasmic movement controller.
b) participate in the endocytosis and exocytosis processes
c) plays a part in the division and development of cells.
d) participate in the secretion and elimination of substances
e) plays a part in cellular communication.
f) Maintains the location of cell organelles and aids in the transport of chemicals from one
area to another.
g) aids in cell movement
h) aids in chromosomal mobility when splitting microfilaments.
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