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.
A hormone is a chemical that your endocrine glands send throughout your body. Hormones (which can be protein or lipid in nature) affect your growth, puberty, metabolism, weigh â¦ t, figure, shape, physical appearance, reproductive behavior, and emotions.he purpose of hormones is to regulate metabolic activity of some other organs or tissues of the body. Three different ways hormones act: 1. Alter the rate of synthesis of your cellular protein. 2.