Neuromuscular Junction — Flashcards

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

What type of muscle fibres do not have striations, troponin or T tubules?_____

Which nerve fiber afferents innervates all three muscle spindle fibres (dynamic nuclear bag, static nuclear bag, and nuclear chain fibers)?_____

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

A sustained contraction with little expenditure of energy is made possible by a _____ mechanism in smooth muscle

Sympathetic stimulation (norepinephrine) of a smooth muscle produces _____ potentials and relaxation.

Chemical Events during Muscle Contraction: No answer _____

Fast twitch muscle fibers are _____ due to decreased myoglobin concentration

Hint: (color)

_____ is absent in smooth muscle but present in skeletal muscle

Hint: Micro-component

Slow twitch muscle fibers are _____ due to increased myoglobin concentration

Hint: (color)