Botulinum toxin is taken up by axon terminals and inhibits the ability of a motor neuron to stimulate a skeletal muscle motor unit to contract by preventing the release of acetylcholine from the axon terminal. Explain how this prevents skeletal muscle contraction 2. Explain why injecting Botox (derived from botulinum toxin) into a superficial facialmuscle reduces the appearance of deep facial wrinkles called muscle lines Hint: Superficial facial muscles are attached at one end to skin