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If a muscle contracts and its fibers shorten is the contraction isometric?
Wiki User
∙ 14y ago
No! It is isotonic. But if the muscle contracts and the fibers do not shorten because the load is greater than the force applied to it, it is isometric.
Wiki User
∙ 14y ago
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Are the most body movements isotonic or isometric?
Most body movements involve isotonic muscle contractions: the muscle fibers either lengthen or shorten as they contract.An isometric contraction involves the muscle fibers staying the same length. Holding something steady, or pushing against a brick wall, are examples of isometric contraction.
In the skeletal muscle what is a Z-disk or Z line?
Z-disks or Z-lines are the points of contraction for contractile proteins. They provide structural support for the transmission of force when the muscle fibers are activated to shorten.
During which phase do the chromatin fibers condense and shorten into chromosomes that are visible under the microscope?
PROPHASE
Some muscle fibers always contracted?
Summation and/or tetanic contraction. Summation is increased muscle contraction until maximal sustained contraction is achieved. Tetanic contraction is sustained muscle contraction without relaxation. If you're inquiring for the Learning Objective Review in an anatomy and physiology course, the question refers to a condition in which some fibers are always contracted... so I'm not sure if they're looking for summation or tetanic contraction - but I think it would be tetanic contraction as summation is more the process leading up to the tetanic contraction...
What is spindle fibers pull the sister chromatids apart?
During anaphase I of meiosis the spindle fibers pull apart in homologous chromosomes. The spindle fibers are composed of micro-tubules. The spindle fibers continue to shorten during anaphase in order to bring the chromosomes at two poles.During anaphase I of meiosis the spindle fibers pull apart in homologous chromosomes. The spindle fibers are composed of micro-tubules. The spindle fibers continue to shorten during anaphase in order to bring the chromosomes at two poles.
What is the type of contraction in which the muscle fibers produce increased tension but does not shorten?
An isometric contraction builds tension but there is no joint movement.
What type of contraction in which the muscle fibers do not shorten are called?
If the muscle can not shorten because the muscle is trying to move a load that is greater than the force, then the contraction is isometric.
Are the most body movements isotonic or isometric?
Most body movements involve isotonic muscle contractions: the muscle fibers either lengthen or shorten as they contract.An isometric contraction involves the muscle fibers staying the same length. Holding something steady, or pushing against a brick wall, are examples of isometric contraction.
During which 2 periods of the cardiac cycle do the heart muscle fibers exhibit isometric contractions?
Isovolumetric contraction and Isovolumetric Relaxation
How is isometric exercise done?
During isometric exercises, muscles contract. However, there is no motion in the affected joints. The muscle fibers maintain a constant length throughout the entire contraction. The exercises are usually performed against an immovable.
What are two fibers that cause contraction?
Actin and myosin are two fibers that cause contraction.
What is the word for muscular contraction involving muscle movement?
Isotonic contractions are the type that involve muscle movement. This movement is due to a change in length as the muscle fibers shorten or lengthen.
What fibers cause a contraction in the ventricle?
Pirkinje Fibers
The type of muscle contraction that is most likely to cause soreness is an isometric contraction?
When you lift the weight with jerk, your muscles may get sore. Few muscle fibers may get dead and get replaced with fibrous tissue, later on. You are supposed to lift the weight up to sixty percent of the maximum capacity, carefully tested.
In the skeletal muscle what is a Z-disk or Z line?
Z-disks or Z-lines are the points of contraction for contractile proteins. They provide structural support for the transmission of force when the muscle fibers are activated to shorten.
When a muscle relaxes it becomes?
Muscle fiber generates tension through the action of actin and myosin cross-bridge cycling. While under tension, the muscle may lengthen, shorten or remain the same. Although the term 'contraction' implies shortening, when referring to the muscular system, it means muscle fibers generating tension with the help of motor neurons
Do muscles fibers stretch during contraction?
No, they contract.
