A device through which electric current can flow in only one direction; spec. one for converting alternating current into direct current. Also in…

Physiology. = neurotransmitter, n.

A hormone which acts as a mediator of nerve impulses at sympathetic nerve synapses; now effectively a disused synonym of noradrenaline, n.

= norepinephrine, n.

A physiologically active substance secreted by nervous tissue; a neurohormone or neurotransmitter.

An undecapeptide found especially in the nervous system and the intestines, which acts on smooth muscle to produce dilation of blood vessels and…

A compound structurally related to epinephrine (adrenaline), which functions as a neurotransmitter in the central and peripheral sympathetic…

A physiologically active substance secreted by a neuron, esp. one released into the circulation.

A substance produced by neurosecretion; a neurohormone.

Any of a family of proteins that act as carriers for the neurohypophysial peptide hormones oxytocin and vasopressin.

Affecting the physiological state of blood vessels, esp. their calibre; vasoactive intestinal (poly)peptide, a polypeptide 28 amino-acids long…

Any chemical substance that is released by a presynaptic nerve ending in response to the arrival of a nerve impulse and crosses the synapse to…

vasoactive intestinal (poly)peptide.

Any peptide with neurohormonal activity.