muscle contraction meaning
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muscle contraction muscle contraction. the process of force-generation in the fibres of any class of muscle, by the interaction of myosin head-groups in the thick filaments with actin molecules in one of the immediately neighbouring thin filaments.oncentric muscle contraction acceleration force generated within contracting agonist muscle tissue, by actin/myosin interaction; agonist muscle force overcomes antagonist muscle resistance, creating a net reduction in length of agonist muscle (see entry above).
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contraction contraction, isotonic (īˈ·s ·t nˑ·ik k n·trakˑ·sh n) , n a muscle contraction in which the muscle length (shortening or lengthening) changes against a counterforce less than that of the contraction thus resulting in movement. an increase in muscular tension without a change in muscle length, as in clenching the teeth. contraction, isotonic muscle. n an increase in muscular tension during movement without resistance (either lengthening or shortening), as in free opening and closing of the jaws.
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Muscle Contractions Isotonic contractions are those which cause the muscle to change length as it contracts causing movement. There are two types of isotonic contraction: -. Concentric. A concentric contraction is a type of muscle contraction in which the muscles shorten while generating force. During a concentric contraction, a muscle is stimulated to contract according to the sliding filament mechanism.
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- Individual muscle fibers contract to their fullest extent; they do not partially contract, this follows the all or none principle. A twitch contraction is a brief contraction of all the muscle fibers in a motor unit in response to a single action potential.
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- A concentric contraction is a type of muscle contraction in which the muscles shorten while generating force. During a concentric contraction, a muscle is stimulated to contract according to the sliding filament mechanism.
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Muscle contraction The contraction produced can be described as a twitch, summation, or tetanus, depending on the frequency of action potentials. In skeletal muscles, muscle tension is at its greatest when the muscle is stretched to an intermediate length as described by the length-tension relationship. Smooth and cardiac muscle contractions are myogenic and can be modulated by the autonomic nervous system.
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Muscle contraction Muscle contraction is the activation of tension-generating sites within muscle fibers. In physiology, muscle contraction does not mean muscle shortening because muscle tension can be produced without changes in muscle length such as holding a heavy book or a dumbbell at the same position.n contrast, a muscle contraction is isotonic if muscle length changes but the muscle tension remains the same. Furthermore, if the muscle length shortens, the contraction is concentric. But if the muscle length lengthens, then the contraction is eccentric.
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Muscle contraction Muscle contraction is the activation of tension-generating sites within muscle fibers. In physiology, muscle contraction does not mean muscle shortening because muscle tension can be produced without changes in muscle length such as holding a heavy book or a dumbbell at the same position.hough the muscle is doing a negative amount of mechanical work, (work is being done on the muscle), chemical energy (in fat, glucose or ATP) is nevertheless consumed, although less than would be consumed during a concentric contraction of the same force.
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Muscle contraction The termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state.Muscle contractions can be described based on two variables: length and tension.A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same. In contrast, a muscle contraction is isotonic if muscle length changes but the muscle tension remains the same.he termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state.
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eccentric contraction eccentric contraction. 1  controlled relaxation of a contracted muscle, movement occurring as a result of the lengthening of the muscle(s). 2  A lengthening action in which a muscle's attachments are drawn away from one another by an external resistance, even though the muscle is activated. Often called negative work.
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muscle (ˈmʌsəl) n. 1. (Anatomy) a tissue composed of bundles of elongated cells capable of contraction and relaxation to produce movement in an organ or part. 2. (Anatomy) an organ composed of muscle tissue. 3. strength or force.
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Muscle contraction The termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state. Muscle contractions can be described based on two variables: length and tension.A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same. In contrast, a muscle contraction is isotonic if muscle length changes but the muscle tension remains the same.Furthermore, if the muscle length shortens, the contraction is concentric.uscle contractions can be described based on two variables: length and tension. A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same.
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- adult, child, and infant rescue breathing > rescue breathing when an adult, child, or infant has a pulse but is not breathing effectively, rescuers should give breaths without chest compressions. this is rescue breathing. for adults, give 1 breath every 5 to 6 seconds, about 10 to 12 breaths per minute. for infants and children, give 1 breath every 3 to 5 seconds, about 12 to 20 breaths per minute. give each breath in 1 second. each breath should result in a visible chest rise. and you should check the pulse about every 2 minutes. because many cardiac arrests happen at home, you may need to give breaths to a family member or close friend when you are off duty.
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- noun. The definition of contraction is the lengthening or shortening of a muscle fiber or a word formed by combining the sounds of two longer words. 1  An example of a contraction is the action of the uterus during the birth process.2  An example of a contraction is the word doesn't from does not.he definition of contraction is the lengthening or shortening of a muscle fiber or a word formed by combining the sounds of two longer words.
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Muscle Contraction Types â Part 1 A concentric contraction is a type of muscle contraction where the length of the muscles shorten while undergoing tension. For example, when you pick up a curl bar and perform a biceps curl, the length of your biceps muscles shorten. Your hands start down by your sides, and ends with your hands up by your shoulders.
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- Muscle contraction is the activation of tension-generating sites within muscle fibers.In physiology, muscle contraction does not mean muscle shortening because muscle tension can be produced without changes in muscle length such as holding a heavy book or a dumbbell at the same position.n contrast, a muscle contraction is isotonic if muscle length changes but the muscle tension remains the same. Furthermore, if the muscle length shortens, the contraction is concentric.
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Concentric Muscle Contractions Updated April 05, 2016. Muscle contractions (also known as muscle fiber activations) occur when a muscle fiber or group of fibers is signaled by the brain via nerves to activate and increase the tension within the muscle.
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Muscle contraction Muscle contraction is the activation of tension-generating sites within muscle fibers. In physiology, muscle contraction does not mean muscle shortening because muscle tension can be produced without changes in muscle length such as holding a heavy book or a dumbbell at the same position.he termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state. Muscle contractions can be described based on two variables: length and tension.
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- 2. contraction-the process or result of becoming smaller or pressed together; the contraction of a gas on cooling. compression, condensation. shrinkage, shrinking-process or result of becoming less or smaller; the material lost 2 inches per yard in shrinkage. coarctation, constriction-tight or narrow compression.
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- The termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibers to their low tension-generating state. Muscle contractions can be described based on two variables: length and tension.A muscle contraction is described as isometric if the muscle tension changes but the muscle length remains the same. In contrast, a muscle contraction is isotonic if muscle length changes but the muscle tension remains the same.urthermore, if the muscle length shortens, the contraction is concentric. But if the muscle length lengthens, then the contraction is eccentric. In natural movements that underlie locomotor activity, muscle contractions are multifaceted as they are able to produce changes in length and tension in a time-varying manner.
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MUSCLE CONTRACTION • MUSCLE CONTRACTION (noun). The noun MUSCLE CONTRACTION has 1 sense: 1. (physiology) a shortening or tensing of a part or organ (especially of a muscle or muscle fiber). Familiarity information: MUSCLE CONTRACTION used as a noun is very rare.
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Muscle contraction Excitation–contraction coupling was a term coined in 1952 to describe the physiological process of converting an electrical stimulus to a mechanical response. This process is fundamental to muscle physiology, whereby the electrical stimulus is usually an action potential and the mechanical response is contraction.n contrast, a muscle contraction is isotonic if muscle length changes but the muscle tension remains the same. Furthermore, if the muscle length shortens, the contraction is concentric. But if the muscle length lengthens, then the contraction is eccentric.
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contraction noun. The definition of contraction is the lengthening or shortening of a muscle fiber or a word formed by combining the sounds of two longer words. 1  An example of a contraction is the action of the uterus during the birth process. 2  An example of a contraction is the word doesn't from does not.ontraction-Computer Definition. The shortening of a word or phrase by omitting letters or syllables. In the English language, a contraction generally, but not always, marks the omitted letters or syllables with an apostrophe or a period. Telco, for example, is a contraction of telephone company.
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Muscle Contractions Isotonic contractions are those which cause the muscle to change length as it contracts causing movement. There are two types of isotonic contraction: -. Concentric. A concentric contraction is a type of muscle contraction in which the muscles shorten while generating force.During a concentric contraction, a muscle is stimulated to contract according to the sliding filament mechanism.oncentric. A concentric contraction is a type of muscle contraction in which the muscles shorten while generating force. During a concentric contraction, a muscle is stimulated to contract according to the sliding filament mechanism.
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concentric contraction (concentric action) the 'true' form of contraction of a muscle in which it shortens against a load (which may be only that of gravity on the relevant body part), and so does positive work. Hence concentric exercise: that in which the principal agonists act concentrically.See also muscle contraction.oncentric contraction contraction resulting in shortening of a muscle, used to perform positive work or to accelerate a body part. It is metabolically more demanding than an eccentric contraction. Called also shortening contraction.
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eccentric contraction eccentric contraction. controlled relaxation of a contracted muscle, movement occurring as a result of the lengthening of the muscle(s). eccentric contraction. a type of muscle contraction that occurs as the muscle fibers lengthen, such as when a weight is lowered through a range of motion. The contractile force generated by the muscle is weaker than an opposing force, which causes the muscle to stretch. Compare concentric contraction. eccentric contraction a type of muscle contraction that occurs as the muscle fibers lengthen, such as when a weight is lowered through a range of motion. The contractile force generated by the muscle is weaker than an opposing force, which causes the muscle to stretch.