Hence, an arrow which bends less is said to have more spine. In order to strike consistently, a group of arrows must be similarly spined. Center-shot bows, in which the arrow passes through the central vertical axis of the bow riser, may obtain consistent results from arrows with a wide range of spines.
Definition of MELATONIN. : a vertebrate hormone that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms.See melatonin defined for kids.ADVERTISEMENT. Greek melas black + -tonin (as in serotonin).efinition of MELATONIN. : a vertebrate hormone that is derived from serotonin, is secreted by the pineal gland especially in response to darkness, and has been linked to the regulation of circadian rhythms. See melatonin defined for kids. ADVERTISEMENT. Greek melas black + -tonin (as in serotonin).
by admin. Dopamine vs Serotonin. Dopamine and serotonin are the biogenic amines, and both are known as neurotransmitters secreted by nerve cells that influence the activity of other nerve cells. These amines are very important substances as they influence mental, emotional, and physical health of humans.opamine vs Serotonin. â¢ Dopamine is derived from tyrosine amino acid, while serotonin is derived from the amino acid called tryptophan. â¢ Dopamine production is localized in the basal ganglia, whereas serotonin production is localized in the raphe nucleus of the reticular formation.