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The regulation of appetite has been the subject of much research in the last decade. Breakthroughs included the discovery, in 1995, of leptin, a hormone that appeared to provide negative feedback. Later studies showed that appetite regulation is an immensely complex process on the border between the hormonal and the nervous systemThe nervous system of an animal coordinates the activity of the muscles, monitors the organs, constructs and processes input from the senses, and initiates actions. see Central Nervous System). In animals with brains, the nervous system also generates and.
The hypothalamusIn the anatomy of mammals, the hypothalamus is a region of the brain located below the thalamus, forming the major portion of the ventral region of the diencephalon and functioning to regulate certain metabolic processes and other autonomic activities., a part of the brain, is the main regulatory organ for appetite. The neurones that regulate appetite appear to be mainly serotinergicSerotonin Chemical name5-Hydroxy-tryptamine or3-(2-aminoethyl)-1''H indol-5-ol Chemical formulaCHNO Molecular mass176. 22 g/mol CAS number50-67-9 SMILESNCCC1 CNC2 C1C C(O)C C2 Serotonin 5-hydroxytryptamine or 5-HT is a monoamine neurotransmitter synthesis, although neuropeptide YNeuropeptide Y (NPY) is a 36 amino acid peptide neurotransmitter found in the brain and autonomic nervous system. It augments the vasoconstrictor effects of noradrenagic neurons. See also Neuropeptide. (NPY) and Agouti-related peptide (AGRP) also play a vital role. Hypothalamocortical and hypothalamolimbic projections contribute to the awareness of hunger, and the somatic processes controlled by the hypothalamas include vagalThe vagus nerve is tenth of twelve cranial nerves and the only nerve that starts in the brainstem (somewhere in the medulla oblongata) and extends way down past the head, all the way down to the abdomen. The vagus nerve is arguably the single most importa tone (the activity of the parasympathicThe parasympathetic nervous system is one of two divisions of the autonomic nervous system. It slows the heart rate, increases intestinal and gland activity, and relaxes sphincter muscles. See also Sympathetic nervous system Nervous system . autonomic nervous systemAnatomy and Physiology of the A. In contrast to the voluntary nervous system, the "involuntary" or autonomic nervous system is responsible for homeostasis, maintaining a relatively constant internal environment by controlling such involuntary functions as), stimulation of the thyroid ( thyroxine regulates the metabolic rate), the hypothalamic-pituitary-adrenal axis and a large amount of other mechanisms.