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Depiction of smooth muscle contraction. Muscle contraction is the activation of tension-generating sites within muscle cells. [1] [2] 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. [1]
The sliding filament theory is a widely accepted explanation of the mechanism that underlies muscle contraction. [6] This model shows the four main and significant steps of the sliding filament theory as well as with a detailed visual.
The stretch reflex (myotatic reflex), or more accurately "muscle stretch reflex", is a muscle contraction in response to stretching a muscle. The function of the reflex is generally thought to be maintaining the muscle at a constant length but the response is often coordinated across multiple muscles and even joints. [1]
Next, step a foot next to one hand like a big runner’s lunge and lift the other hand off the floor. When you rotate the upper body, the dynamic stretch will give a nice twist through the midsection.
The endplate potential is thus responsible for setting up an action potential in the muscle fiber which triggers muscle contraction. The transmission from nerve to muscle is so rapid because each quantum of acetylcholine reaches the endplate in millimolar concentrations, high enough to combine with a receptor with a low affinity, which then ...
Pilates works, she says, because the movements “focus on building not just strength during the concentric phase of muscle contraction — when the muscle fibers shorten — but also during the ...
An impulse from a nerve cell causes calcium release and brings about a single, short muscle contraction called a muscle twitch. If there is a problem at the neuromuscular junction, a very prolonged contraction may occur, such as the muscle contractions that result from tetanus. Also, a loss of function at the junction can produce paralysis. [5]
At the muscle-tendon interface, force is transmitted from the sarcomeres in the muscle cells to the tendon. [5] Muscles and tendons develop in close association, and after their joining at the myotendinous junction they constitute a dynamic unit for the transmission of force from muscle contraction to the skeletal system. [27]