Mar 14, 2022 · Neurotransmitters are chemical molecules that carry messages or signals from one nerve cell to the next target cell. They’re part of your body’s communication system.

Gamma-aminobutyric acid (GABA) is an inhibitory neurotransmitter in your brain, meaning it slows your brain’s functions. GABA is known for producing a calming effect.

Types of photoreceptors. The human eye has two main types of photoreceptors, rods and cones, which get their names from their shapes. Rods. These photoreceptors are tall and have a …