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Muscle contraction is the activation of tension-generating sites within muscle cells. This can be the result of a voluntary or involuntary stimulus. Muscle contraction is often followed by muscle relaxation, when contracted muscles return to their normal state. The physiological concept of muscle contraction is based on two variables: length and tension. The evaluation of muscle strength and muscle contraction is a routinely included procedure in the patient physical exam.
| Characteristics | Values |
|---|---|
| Muscle contractions | Occur when you lift something heavy |
| Concentric contractions | Occur when your muscle is actively shortened |
| Eccentric contractions | Occur when you lower something heavy |
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What You'll Learn
- Muscle contraction is the tightening, shortening or lengthening of muscles when you do some activity
- Muscle contraction is the activation of tension-generating sites within muscle cells
- Skeletal muscle works in conjunction with the bones of the skeleton to create body movements
- Muscle contraction is followed by muscle relaxation, which is a return of the muscle fibres to their low-tension state
- Muscle contraction is routinely evaluated in a patient physical exam
Muscle contraction is the tightening, shortening or lengthening of muscles when you do some activity
Muscles can generate force and movement. Skeletal muscle, for example, works in conjunction with the bones of the skeleton to create body movements. It is also associated with the diaphragmatic, esophageal, and eye muscles. Skeletal muscle serves a variety of purposes, including moving the body, breathing, and swallowing.
Muscle contraction is the activation of tension-generating sites within muscle cells. Muscle tension can be produced without changes in muscle length, such as when holding something heavy in the same position. The termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibres to their low-tension state.
The evaluation of muscle strength and muscle contraction is a routinely included procedure in the patient physical exam. The Medical Research Council Manual Muscle Testing scale is the most commonly used muscle strength grading system, where scores from 0 to 5 are assigned based on patient ability.
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Muscle contraction is the activation of tension-generating sites within muscle cells
Muscles are organs that contain cells that can contract, and they can generate force and movement. Skeletal muscle works in conjunction with the bones of the skeleton to create body movements. Skeletal muscle serves a variety of purposes, including moving the body, breathing, and swallowing. It is composed of cells collectively referred to as muscle fibres.
The evaluation of muscle strength and muscle contraction is a routine procedure in the patient physical exam. The Medical Research Council Manual Muscle Testing scale is the most commonly used muscle strength grading system, where scores from 0 to 5 are assigned based on patient ability. A score of 0 refers to no muscle activation, while a score of 5 is muscle activation against both gravity and full resistance.
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Skeletal muscle works in conjunction with the bones of the skeleton to create body movements
Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights. Muscle contraction is often followed by muscle relaxation when contracted muscles return to their normal state.
Muscles can generate force and movement. Skeletal muscle serves a variety of purposes, including moving the body, breathing, and swallowing. Skeletal muscle contracts primarily in response to a voluntary stimulus.
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Muscle contraction is followed by muscle relaxation, which is a return of the muscle fibres to their low-tension state
Muscle contraction is the activation of tension-generating sites within muscle cells. This can happen when you hold or pick up something, or when you stretch or exercise with weights. Muscle contraction is followed by muscle relaxation, which is a return of the muscle fibres to their low-tension state.
Muscles are tissue that contract to move parts of your body. You have different types of muscle: skeletal, smooth, and cardiac. Skeletal muscles are attached to bones and come in pairs, for example, your biceps muscles bend your elbows, and your triceps muscles straighten them. Skeletal muscles are voluntary, meaning you move them when you decide to. Smooth muscles surround your arteries, veins, and intestines. The smooth muscles in your blood vessels contract and relax to adjust blood flow. The smooth muscles in your intestines contract to move food and stool through your digestive system. You can't control your smooth muscles. They do their job without you thinking about it.
In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as when holding something heavy in the same position. Skeletal muscles are composed of cells collectively referred to as muscle fibres. Each muscle fibre is multinucleated with its nuclei located along the periphery of the fibre.
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Muscle contraction is routinely evaluated in a patient physical exam
Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights. Muscle contraction is often followed by muscle relaxation when contracted muscles return to their normal state.
Muscle contraction is the activation of tension-generating sites within muscle cells. In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as when holding something heavy in the same position. The termination of muscle contraction is followed by muscle relaxation, which is a return of the muscle fibres to their low tension-generating state.
Skeletal muscle works in conjunction with the bones of the skeleton to create body movements. Additionally, it is also associated with the diaphragmatic, oesophageal, and eye muscles. Thus, skeletal muscle serves a variety of purposes, including moving the body, breathing, and swallowing.
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Frequently asked questions
Muscles are tissue that contracts to move parts of your body.
There are three types of muscles: skeletal, smooth, and cardiac. Skeletal muscles are attached to bones and come in pairs. Smooth muscles surround your arteries, veins, and intestines. You can't control your smooth muscles.
Muscle contraction is the activation of tension-generating sites within muscle cells. In physiology, muscle contraction does not necessarily mean muscle shortening because muscle tension can be produced without changes in muscle length, such as when holding something heavy in the same position.
