Nerve and Muscle Physiology — Flashcards

Stretch reflex:Activation of _____ motor neurons leads to indirect contraction of the muscle

The first step of muscle contraction occurs when the _____ neuron depolarizes, opens Ca2+ channels and ACh is released into the motor end plate.

Progressively weakening diaphragmatic contractions during maximal voluntary ventilation with intact phrenic nerve stimulation indicates either/or:#1 - Pathology of the _____ junction#2 - abnormally rapid diaphragmatic muscle fatigue

The _____ efferent system is excited by signals from the bulboreticular facilitatory region of the brain stem.

In the myocardial cell, high intracellular Ca2+ binds to _____, causing tropomyosin to move out of the way, which allows actin and myosin interaction

When the membrane potential is _____ mv the inactivation gate of Na+ channel is closed

Fast twitch muscle fibers perform less _____ due to decreased mitochondria

When the membrane potential is _____ mv the activation gate of Na+ channel is closed

The inverse muscle stretch reflex uses _____ organs to monitor muscle tension

In muscle hypertrophy, the _____ isoform of myosin heavy chain is replaced by the beta isoform (alpha/beta)