hormone |
an organic chemical messenger released from endocrine cells that travels through the blood system to interact with cells some distance away and cause a bio-response. Secreted by specialized non-neural cells into the blood |
neurohormone |
substance secreted by neurons into the blood that may be stored in neurohemal organ prior to release |
neuropeptide |
a peptide hormone produced by a neuron |
neurosteroid |
a steroid hormone produced by a neuron |
neuromodulator |
substances that do not directly activate post-synaptic receptors but that enhance the excitatory or inhibitory responses of these receptors |
neurotransmitter |
chemical messenger that acts across the synaptic space |
chemical messenger |
substance produced by a cell that will in turn affect the function of another cell |