Ghrelin regulates body weight in a short-term aspect - when its levels are high a person feels hungry and when they are well fed - ghrelin levels drop. When on a diet the stomach produces a lot more ghrelin, sending signals of hunger to the brain.
Leptin is a peptide hormone that plays a very important role in regulating intake and spending of energy in the human body. Leptin affects appetite and metabolism.
Prolactin is a hormone produced and secreted by the anterior pituitary - the front part of the pituitary gland. Prolactin is also called the hormone of lactation.
Testosterone is a steroid hormone belonging to the group of sex hormones. Along with sexual activity, which includes regulation of the libido, fertility and muscle mass, testosterone helps increase energy.
Serotonin is a monoamine neurotransmitter, synthesized in the brain and gastrointestinal tract. Serotonin plays a very important role in regulating the processes of sleep, cardiac rhythm and breathing.
Progesterone is a steroid hormone, which plays a role in pregnancy, the menstrual cycle and embryogenesis in humans. Progesterone prepares the lining of the uterus to accept the fetus and also controls the normal course of pregnancy.
Estrogen is a major female hormone that is produced in the ovaries. In fact, estrogen determines the outer appearance of women.
Norepinephrine, also known as noradrenaline, is an important hormone, which, along with epinephrine, is produced in the core of the adrenal glands.
Adrenaline is an important hormone and neurotransmitter, which is produced in the cells of the adrenal core, and in certain neurons of the central nervous system. The effect of adrenaline is quite short-lived - a mere 5 minutes.
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