Nobody downloaded yet

Sliding Filament Theory - Essay Example

Comments (0) Cite this document
Summary
Skeletal muscles are attached to the bones of the skeleton. They serve to produce movements and are used in locomotion, maintenance of posture, and almost in any activities a body performs. Microscopically, their cells are elongated and multinuclear, and the contractile elements within them show cross-striations…
Download full paperFile format: .doc, available for editing
GRAB THE BEST PAPER92% of users find it useful
Sliding Filament Theory
Read TextPreview

Extract of sample "Sliding Filament Theory"

Download file to see previous pages Surrounding the whole muscle is a layer of connective tissue, epimysium that encloses the individual fascicules together. The individual muscle fibers are made up of filamentous bundles that run along the length of the fiber. Most of the interior of the fibre consists of the protein filaments which constitute the contractile apparatus, grouped together in bundles called myofibrils. Each myofibril consists of a repeating unit, known as a sarcomere. The alignment of the sarcomeres between adjacent muscle fibers is responsible for the characteristic striations in the striated skeletal muscle fibers. The sarcomere is the fundamental contractile unit of the skeletal muscles. When a muscle fiber is viewed by polarized light, the sarcomeres are seen as alternating dark and light zones. Some regions appear dark because they refract the polarized light. This property is called anisotropy, and the corresponding band is known as an A band. The light regions do not refract polarized light and are called isotropic and are denoted as I bands. Each I band is divided by a characteristic line known as a Z line, and the unit between successive Z lines is the sarcomere [1].
Under electron microscopic examination with high magnification, the A bands are seen to be composed of thick filaments arranged in a regular order. The I bands consist of thin filaments. When the muscle is in the resting state, that is, when there is no shortening of the fibers due to contraction, a pale area can be seen in the center of the A band. This is known as the H zone, and it corresponds to the region where the thick and thin filaments do not overlap, which otherwise is the case throughout the muscle fiber architecture. In the center of each H zone, there is a line called M line. It is in this line, links are formed between adjacent thick filaments. The principal protein of the A bands is myosin, while that of I bands is actin. The interaction between these proteins is fundamental to the contractile process in the skeletal muscle at the ultrastructural and molecular levels. There are two types of actin filaments. One is globular in shape, known as globular or G actin subunits, and the other is filamentous of F actin. The actin filaments of the I band are made by joining many G actin subunits together by polymerization to form F actin. The F actin, in turn, is stabilized by binding to the Z line. The thick filaments are made up of an assembly of myosin molecules together. Each myosin molecule consists of two heavy chains. Each of these heavy chains has two light chains associated with a head region that is globular. The junction between the head region and the long tail contains a hinge. This hinge allows the myosin to generate the force required for muscle contraction. The tail regions of the myosin molecules associate together to form the thick filaments. Each thick filament consists of several hundred myosin molecules [2].
The sliding filament theory explains muscle contraction, and the structure of skeletal muscle provides important clues to the mechanism of contraction. The width of the A bands or thick filament areas in striated muscle remains constant, regardless of the length of the entire muscle fiber, while the width of the I bands or the thin-filament areas varies ...Download file to see next pagesRead More
Cite this document
  • APA
  • MLA
  • CHICAGO
(“Sliding Filament Theory Essay Example | Topics and Well Written Essays - 1500 words”, n.d.)
Sliding Filament Theory Essay Example | Topics and Well Written Essays - 1500 words. Retrieved from https://studentshare.org/miscellaneous/1515131-sliding-filament-theory
(Sliding Filament Theory Essay Example | Topics and Well Written Essays - 1500 Words)
Sliding Filament Theory Essay Example | Topics and Well Written Essays - 1500 Words. https://studentshare.org/miscellaneous/1515131-sliding-filament-theory.
“Sliding Filament Theory Essay Example | Topics and Well Written Essays - 1500 Words”, n.d. https://studentshare.org/miscellaneous/1515131-sliding-filament-theory.
  • Cited: 0 times
Comments (0)
Click to create a comment or rate a document

CHECK THESE SAMPLES OF Sliding Filament Theory

Theory

... Module: Democracy as an End in Itself or a Means to an End There has been a belief that majority of thewestern nations achieved prosperity due to their advancement in democracy. Advocates of democracy have been fighting against socialism and communism for over 200 years but since the World War II democracy started to gain root in many countries especially in the east. The Cold War marked quite a significant period where democracy emerged a victor over communism. Using this analysis democracy acts as an end to countries that have been undergoing turmoil or other instabilities. Other outlooks bring forth the concept that democracy is a means to an end. In considering each claim it is important to look into what democracy actually... Module:...
4 Pages(1000 words)Term Paper

Describe the properties and functions of the smooth, skeletal and cardiac muscle. (b)Explain the sliding filament hypothesis of

...is studded in the center with large structures called myofibrils. These myofibrils are composed of two types of myofilaments; thick myofilaments and thin myofilaments. Thick myofilaments are made up of a protein called myosin. This protein has a special shape that is vital for its function. The thin myofilament is composed of many proteins most importantly tropomyosin, troponin and actin. Actin is important because it is the myosin binding molecule. The arrangement of these myofilaments is very precise and it is mandatory that to understand how both thick and thin filaments are in present in close proximity before understanding the sliding filament hypothesis. (Clark, 2005, p. 142-143)...
6 Pages(1500 words)Assignment

Theory

...? Part Theory Assessment INTRODUCTION Business environments are constantly changing and pressing businesses to strengthen competitive positions with adaptability. Businesses are also constantly been striving to adopt the performance means for gaining sustained position in market. In the quest of sustainability and lead, many businesses adopted an extra edge in business operations. For instance, Japanese companies have been stringent in following Total Quality Management techniques for driving operational efficiencies. On the other hand, there had been firms polarized towards achieving sustainability with strengthening positioning aspect. Both aspects being significance to business; however, the real benefit lies in what is named... as...
20 Pages(5000 words)Essay

Theory

...?Le Corbusier’s Spatial Design Oeuvre Introduction The contribution of Le Corbusier to architectural theory and practice, as well as urban planning, in the twentieth century cannot be misjudged. Through the widespread circulation of his building proposals and projects and his comprehensive theoretical effort, practically no other designer has had the same challenging and powerful effect on the treatise of modern architecture. He viewed his theoretical perspectives as an ‘appeal to architects’ (Samuel, 2007, p. 41) which must function as a guide to acknowledging the path to a form of architecture for the modern period. Le Corbusier, the designer, is the re-embodiment of the visual artist Charles-Edouard Jeanneret. Then...
11 Pages(2750 words)Essay

Theory

...The word theory has different meanings in different contexts. In everyday life ‘theory’ means an opinion, a guess, a hunch. However, it is not that way in science. According to Gordana Dodig – Crnkovic (2001), “science is the systematic study of the properties of the physical world, by means of repeatable experiments and measurements, and the development of universal theories that are capable of describing and predicting observations. Statements in science must be precise and meaningful, such that other people can test them (in order to establish “universality”)” (p.6). Correspondingly, theory is science is a logical and mathematical explanation, a framework describing...
2 Pages(500 words)Essay

Theory

...Outline: Behavioral and Rational Emotive Behavior Theory Theory: a) Key Concepts The basis of this theory, as discovered by Albert Ellis-the founder of ‘cognitive-behavioral therapy’, revolves around the fact that people’s emotional functioning are directly related to their beliefs. Thus, self-defeating behaviors result from irrational beliefs, which make the people feel angry, depressed and full of anxiety. This provides the natural reflection of human nature. Basic Philosophy The values involved in the basic philosophy of this theory include Self and social interest and self-direction. It also involves acceptance of life’s ambiguity, while having flexible attitude. The tolerance of others... ’ viewpoints and open attitude towards change...
3 Pages(750 words)Research Paper

Sash Sliding windows

...Sash Windows Sash Windows Sash window are also called hung sang window and is composed of one or more movable panels referred to as sashes.The panels form a frame that holds panes of glasses often separated by other panes by muntins. Instead of cords and counterweight, modern sash windows are made of spiral balances mounted on the inside of the window jambs. This eliminates the traditional weight boxes. The balances are constructed to match with the size and weight of individual glazed sashes. Components of spring balance Each balance is made of torsion spring and a spiral rod housed in a tube. Its top end is fixed to the jamb and the inner spiral remains attached to the bottom of the sash. The complete unit is housed in a jamb... Windows...
1 Pages(250 words)Essay

Theory

...Theory al Affiliation A hypothesis is defined as an existing relationship which can be ed to a testbetween two variables (Koch, 1999). One variable must be independent, and the other variable is dependent. A scientific hypothesis is bases on observations made whereas a working is subject to further research (Koch, 1999). Testing a hypothesis Statisticians follow a predetermined process to establish whether to accept or reject a hypothesis (Koch, 1999). The first step involves stating the hypothesis whereby the statistician states the null and the alternative hypothesis. Hypothesis are stated, in a way, that makes them mutually exclusive, that is, if one is acceptable or true, then the other one is false or is rejected(Koch,1999... al...
1 Pages(250 words)Essay

Theory

...Research Methods Introduction To understand use statistics, one needs some little knowledge on research method. This is because statistics are data generated through intensive research for the users to crystallize own tangible and up to date information. Generally, statistics acts as a tool that helps in availing pertinent answers to the already devised research questions. Therefore, an understanding of research methodology facilitates the understanding of statistics. This essay seeks to avail information regarding research methods, approaches and the measurement of crime rates. Research Approaches In conducting research, certain approaches may be required that embrace use of qualitative or quantitative data (Maxfield, & Babbie... Methods...
2 Pages(500 words)Essay

THEORY-

... "Evolution" In the analysis and study of literature, there are two broad attitudes, descriptive, and theoretical attitudes respectively. When dealing with structural analysis there are two approaches, theoretical and non-descriptive approach. The work of analysis is considerably seen as the manifestation of an abstract structure, and an understanding of that structure is the real objective of structural analysis. The narrative or the story is one of the many possible ways an abstract idea is compilable in some form and not the description of this that is the objective but instead, its the understanding of its structure (Roman, 1975). It shows that the structure has a logical importance rather than a particular one. Basing... "Evolution" In...
3 Pages(750 words)Essay
sponsored ads
We use cookies to create the best experience for you. Keep on browsing if you are OK with that, or find out how to manage cookies.

Let us find you another Essay on topic Sliding Filament Theory for FREE!

Contact Us