PNB 2264 Study Guide - Quiz Guide: Frog Legs, Gastrocnemius Muscle, Calibration

• School: UConn
• Department: Physiology and Neurobiology
• Course: PNB 2264
• Professor: Kristen Kimball

Document Summary

Motor unit: one motor neuron and all muscle fibers it innervates. Neuromuscular junction/contraction: action potential from motor neuron has reached into the terminals. Single action potential in muscle fiber is generated: evokes single twitch. Single contraction and relaxation cycle in response to a single threshold stimulus: curve in twitch is later than ap and lasts longer. If muscle ap is supposed to be an all or non-response how can you explain an increase or decrease in force of muscle contraction: recruitment describes a multiple motor unit summation, stimulus too high, more fibers. Strong enough stimulus can evoke two action potentials and. Resting fiber length affects tension generate a much stronger force: depends on how stretched the muscle is. Stretched muscle fibers, little overlapping: thick filaments can move thin a short distance before it starts overlapping. Single twitch does not represent maximal forces a muscle fiber can do. Complete tetanus: muscle fibers achieve a state of maximal contraction.