The respiratory system takes in air starting from your nose and mouth, then sends it through a tube in your throat called the trachea, and then into your lungs. The trachea connects to the lungs by splitting into two tubes called bronchiole tubes, which eventually split into smaller and smaller tubes.
Causes and contributors of low Serotonin Levels and Deficiency. Serotonin is synthesized in the brain and body from tryptophan an amino acid. Tryptophan converts into 5- hydroxytryptophan then into serotonin (5-hydroxytryptamine), if all of the co-factors are present.atural Serotonin is involved in the regulation of several processes within the brain, including, depression, mood, emotions, aggression, sleep, appetite, anxiety, memory and perceptions. Serotonin regulates these processes through pathways that innervate (connect to) different brain regions.
Serotonin is a chemical produced by nerve cells. The serum serotonin level is a blood test to measure the amount of serotonin in your body.