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Occurrence of additional twitch contractions
- Summation is the occurrence of additional twitch contractions before the previous twitch has completely relaxed. Summation can be achieved by increasing the frequency of stimulation, or by recruiting additional muscle fibers within a muscle.
Jan 17, 2023 · Muscle contractions can be termed twitch, summation or tetanus. A twitch contraction is the period of contraction and relaxation of a muscle after a single stimulation. Summation is the occurrence of additional twitch contractions before the previous twitch has completely relaxed.
Searches related to define summation in anatomy meaning
The duration of a muscle twitch when the muscle returns to its resting length. Two ways the force of a muscle contraction can be increased. Summation and recruitment. Summation. Increases the force of contraction by increasing the frequency of the stimulus of the muscle fibers. Recruitment.
summation, in physiology, the additive effect of several electrical impulses on a neuromuscular junction, the junction between a nerve cell and a muscle cell. Individually the stimuli cannot evoke a response, but collectively they can generate a response.
- The Editors of Encyclopaedia Britannica
Summation is the process by which a neuron integrates multiple excitatory and inhibitory inputs to determine if the overall signal is strong enough to reach the threshold for generating an action potential.
Summation, which includes both spatial summation and temporal summation, is the process that determines whether or not an action potential will be generated by the combined effects of excitatory and inhibitory signals, both from multiple simultaneous inputs (spatial summation), and from repeated inputs (temporal summation).
At the molecular level, summation occurs because the second stimulus triggers the release of more Ca ++ ions, which become available to activate more cross-bridging while the muscle is still contracting from the first stimulus. Summation results in greater contraction of the motor unit.
derangedphysiology.com · main · cicm-primary-examTwitch, summation and tetanus | Deranged Physiology
Apr 29, 2023 · Summation is the additive effect of frequent contractions, where a muscle fibre is stimulated again before it has relaxed completely from a prior contraction: The tension generated by the second contraction is additive with the tension already being produced by the fibre.
