A gardener was accidentally poisoned by a weed killer that inhibits acetylcholinesterase. Which of the following alterations in neurochemical transmission at brain cholinergic synapses is the most likely result of this poisoning?
Blockade of cholinergic receptors A pileup of choline outside the cholinergic neuron (in the synaptic cleft) A pileup of acetylcholine outside the cholinergic neuron (in the synaptic cleft) Up-regulation of postsynaptic cholinergic receptors