summation

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.