However, the red-yellow pheomelanin is believed to cause the warm, golden, or auburn tones found in some types of brown hair. The range of colors produced by melanins is limited to shades of yellow, brown, red, and black. Grey hairs contain only a few melanin granules, spread out through the hair.
Hormones are your body's chemical messengers. They travel in your bloodstream to tissues or organs. Endocrine glands, which are special groups of cells, make hormones. The major endocrine glands are the pituitary, pineal, thymus, thyroid, adrenal glands, and pancreas. In addition, men produce hormones in their testes and women produce them in their ovaries.
It links the endocrine system with the nervous system by way of the hypothalamus.The pituitary gland is known as the âmasterâ endocrine gland. The hypothalamus controls the production of hormones in both lobes. The pituitary gland produces many important hormones, some of which act on other glands to make them produce hormones. The pituitary gland releases at least 9 hormones that have important effects on the bodyâthese include the thyroid stimulating hormone (TSH), adrenocorticotrophic hormone stimulates the adrenal glands.