Explain how a skeletal muscle contracts and relaxes

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Explain how a skeletal muscle contracts and relaxes

Explain how a skeletal muscle contracts and relaxes

Share on Facebook Muscle contraction and relaxation occurs in your body multiple times during the course of a day, especially if you are active. Muscles have fibers, and the fibers are grouped into fascicles, or bundles, which form individual skeletal muscles.


There are three states in which muscles exist: Your brain and central nervous system have a lot to do with the process of muscles contraction and relaxation.

Central Nervous System Your central nervous system controls most of the action your body performs on a daily basis. It is your brain communicating with your body, telling your muscles to contract or relax.

Without direct connection of nerves, muscles do not contract. Neurons Neuron signals are produced in your spinal cord through neurological pathways, and then into the fibers of contracting muscles.

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There is something called a "motor end plate" in the fibers of your muscles; it is a reactive plasma membrane and its job is to communicate contraction and relaxation. Muscle Contraction Muscle fibers contract in response to nerve stimuli from your central nervous system. This is an active process that involves the release of calcium at the cellular level of the muscle fiber, and causes a "ratcheting" effect that results in the shortening, or contracting, of individual muscle fibers.

Muscle Relaxation Once your muscle contracts, the space between the motor end plate and the fibers releases an enzyme called acetylcholinesterase, which ends the stream of action.

This causes the muscle to stop contracting and begin relaxation. When relaxation begins, the opposing muscle contracts and pulls the original contracting muscle back into place.

Her articles on yoga and healthy living have been featured on websites such as Arizona Yoga Community, and Zizzo has also been published in magazines such as " Magazine," as well as other various online publications.May 28,  · First, muscles can actively contract but cannot actively relax.

The Physiology of Skeletal Muscle Contraction — PT Direct

It requires something else - a second opposing muscle contracting, the pull of gravity, etc. - to make a muscle relax Status: Resolved. Chapter 4: Cervical Spine Trauma The cervical spine provides musculoskeletal stability and supports for the cranium, and a flexible and protective column for movement, balance adaptation, and housing of the spinal cord and vertebral artery.

Explain how a skeletal muscle contracts and relaxes

Facts, opinions, and conclusions for the handicapper. In this article, we will examine a number of questions. You may read through the document top-to-bottom or . The main function of the digestive system is to break down food so that it can be used by the body for energy, cell growth and repair.

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