where is most of the body's serotonin located
Serotonin Serotonin (/ˌsɛrəˈtoʊnɪn, ˌsɪərə-/[6][7][8]) or 5-hydroxytryptamine (5-HT) is a monoamine neurotransmitter. Biochemically the indoleamine molecule is derived from the amino acid tryptophan.[9] Serotonin is primarily found in the enteric nervous system located in the gastrointestinal tract (GI tract). However, it is also produced in the central nervous system (CNS), specifically in the Raphe nuclei located in the brainstem. Additionally, serotonin is stored in blood platelets and is released during agitation and vasoconstriction, where it then acts as an agonist to other platelets.[10] Serotonin is popularly thought to be a contributor to feelings of well-being and happiness.[11]
Eye Rods cannot distinguish colours, but are responsible for low-light (scotopic) monochrome (black-and-white) vision; they work well in dim light as they contain a pigment, rhodopsin (visual purple), which is sensitive at low light intensity, but saturates at higher (photopic) intensities. Rods are distributed throughout the retina but there are none at the fovea and none at the blind spot. Rod density is greater in the peripheral retina than in the central retina.
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Backshore Sediments in this area are well-sorted and well-rounded. Its grain sizes are mainly coarse sand and medium sand, which are larger than that in littoral barrier dune.The sedimentary structures include parallel bedding and low-angle cross-bedding.