Morphine

Neurohormones affect the nervous system by modifying the way in which nerve cells respond to transmitters. Enkephalins and endorphins are small peptides that act as natural analgesics and bind to the same receptors as morphine.

See also: Neurotransmitters and Receptors, Biochemistry of Neurotransmission, Neurotransmitters and Biological Regulators

INTERNET LINKS:

1. Neurotransmitter Receptors and Their Effects

2. Neurotransmitter Newsletter