what is the main difference between hormones and neurotransmitters?
Neurotransmitters: Neurotransmitters are proteins, amino acids or gases. Hormones: Hormones are produced in endocrine glands and are secreted into the blood stream. Neurotransmitters: Neurotransmitters are released by presynaptic nerve terminal into the synapse. Hormones: Hormones are transmitted through blood.