Following Denervation of a Muscle, Uniform Recordings from a Microelectrode

question 40

Multiple Choice

Following denervation of a muscle, uniform recordings from a microelectrode along the entire muscle fiber means that

• A) ACh receptors were both up-regulated and redistributed themselves along the muscle.
• B) ACh receptors increased their affinity for acetylcholine at the end-plate.
• C) the end-plate grew, thereby increasing the surface area, which could accommodate more ACh receptors.
• D) end-plates became more numerous, covering a greater surface area of the muscle.
• E) ACh was released from the presynaptic neuron in higher quantal yield.

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