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A thermocline (also known as the thermal layer or the metalimnion in lakes) is a thin but distinct layer in a large body of fluid (e.g. water, such as an ocean or lake, or air, such as an atmosphere) in which temperature changes more rapidly with depth than it does in the layers above or below.
Choline is the backbone of a nervous system signal moleculeâor neurotransmitterâcalled acetylcholine. The importance of acetylcholine cannot be overstated. The part of your nervous system that runs your heart and keeps your intestines moving along runs largely on acetylcholine.