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.
Other Hormone-Producing Tissues and Organs Indicate the endocrine role of the kidneys, the stomach and intestine, the heart, and the placenta. Developmental Aspects of the Endocrine System Describe the effect of aging on the endocrine system and body homeostasis.ther Hormone-Producing Tissues and Organs Indicate the endocrine role of the kidneys, the stomach and intestine, the heart, and the placenta. T arget organ: A tissue or organ upon which a hormone exerts its action; generally, a tissue or organ with appropriate receptors for a hormone.