A scientist labels ACh with fluorescent dye to be able to visualize under the microscope where ACh travels and binds. She takes an image of the motor end plate and see that ACh is
A. bound to receptors on the sarcoplasmic reticulum.
B. bound to Ca2+ ions.
C. inside the muscle cell sarcoplasm.
D. bound to acetylcholinesterase in the end plate membrane.
E. bound to muscarinic receptors at the end plate.
Answer: D
Anatomy & Physiology
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