Electronic signals are sent through the nuerons of the brain to the sight of desired movment. When they reach this spot the signals close an electric pathway and tell to muscle to expand or contract.
The physiology of muscles is complex and can not be completely explained in a reasonable amount of time. The following is an extremely truncated explanation. Muscles is composed of interwoven fibers made of titin and actin. If you fold your hands so your fingers are interwoven, then pull them slightly apart you have a rough model of the sarcomere, the smallest functional unit of muscle. Special motor protein called myosin is located in the sarcomere that utilizes ATP as energy to pull the fibers together (pulling your fingers so your hands move together in our rough model). This produces contraction of a muscle, which allows us to move and perform work. Muscles are passively stretched back to their original length when they stop contracting.
it is due to formation of actin and myosin bands
by moving it
Muscle tissue contracts or shortens, allowing movement.
to contract to cause movement.
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A LOT what med are you taking?
muscle fibers
muscle cells
All muscles cause movement due to the contraction of coupled muscle cells. Perhaps the question intended to inquire about muscles that cause a bending in which the joint angle decreases. Muscles of this type are called flexor muscles (biceps for example).
Muscle
Muscle.
Muscle cells are specialized for movement of the body. They have extra mitochondria so that they can utilize the energy necessary to contract muscles. A whole chain of muscle cells contracting will cause the muscle to "flex."
These are found in muscle cells. The action causes contractions. They cause a sliding or shortening movement.