Biochemistry Which of the following would increase the levels of acetylcholine in the synaptic cleft? A Administration of glucose B Activation of muscarinic receptors C Activation of nicotinic receptors D Inhibition of acetylcholinesterase 💡 Explanation Which of the following would increase the levels of acetylcholine in the synaptic cleft? ✓ Correct Answer: D. Inhibition of acetylcholinesterase