summation

(noun)

The occurrence of additional twitch contractions before the previous twitch has completely relaxed.

Related Terms

  • tetanu
  • tetanus
  • twitch
  • skeletal muscle
  • fascicle

Examples of summation in the following topics:

  • Interactions of Skeletal Muscles

    • Skeletal muscles interact to produce movements by way of anatomical positioning and the coordinated summation of innervation signals.
    • This addition is termed summation.
    • Within a muscle summation can occur across motor units to recruit more muscle fibers, and also within motor units by increasing the frequency of contraction.
    • Repeated twitch contractions, where the previous twitch has not relaxed completely are called a summation.
    • Explain the summation interactions of skeletal muscles and how they affect movement
  • Postsynaptic Potentials and Their Integration at the Synapse

    • Postsynaptic potentials are subject to spatial and temporal summation.
    • This figure depicts the mechanism of temporal summation in which multiple action potentials in the presynaptic cell cause a threshold depolarization in the postsynaptic cell.
  • Localization of Pain

    • Also, temporal summation is a potent mechanism for the generation of referred muscle pain.
    • Temporal summation, shown in the diagram, is the transmitting of signals with increased frequency of impulse, thus increasing the strength of signals in each fiber.
    • Temporal summation is a potent mechanism for the generation of referred muscle pain.
  • Renal Clearance

    • These types of clearance all add up to a summation known as total body clearance, which refers to the removal of a substance from the plasma over time, incorporating all routes of removal in the body.
  • Velocity and Duration of Muscle Contraction

    • If another contraction occurs before complete relaxation of a muscle twitch, then the next twitch will simply sum onto the previous twitch, a phenomenon called summation.
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