Henry Dale Proposed That Neurons Could Only Release One Type

 Henry Dale proposed that neurons could only release one type of chemical messenger. This assertion is

A) correct.
B) incorrect, as some neurons can release two small molecules in different locations.
C) partially correct, in that neuropeptides are never found in the same neuron as amines or amino acids.
D) partially correct, as neurons nearly always release more than a dozen neurotransmitters whenever stimulated.