Orexin

Definition

Orexin, also known as hypocretin, is a neurotransmitter that regulates arousal, wakefulness, and appetite.

Related terms

Neurotransmitter:

These are chemical messengers used by neurons to send signals across synapses (the tiny gaps between neurons).

Sleep-Wake Cycle:

This refers to our 24-hour daily sleep pattern which consists of approximately 16 hours of daytime wakefulness and 8 hours nighttime sleep.

Leptin:

A hormone predominantly made by adipose cells that helps regulate energy balance by inhibiting hunger.