Harmless and beneficial bacteria far outnumber harmful varieties. Thousands of bacterial species live commensally in humans, and many provide health benefits to humans, aiding in digestion, for example, or helping to prevent the establishment of colonies of pathogenic bacteria.armless and beneficial bacteria far outnumber harmful varieties. Thousands of bacterial species live commensally in humans, and many provide health benefits to humans, aiding in digestion, for example, or helping to prevent the establishment of colonies of pathogenic bacteria.
ADH (Antidiuretic Hormone) The brain and kidneys regulate the amount of water excreted by the body. When the blood volume is low, the concentration of solutes in the blood is high. When the hypothalamus senses this low blood volume and increased serum osmolality it synthesizes ADH, a small peptide molecule.
Role of Hormones Antidiuretic hormone (ADH): Controls reabsorption of water in the blood. (more ADH, more water reabsorption) Made in the hypothalamus but stored in and released from the pituitary gland in the brain. Increases the permeability of the walls of the distil tubules and collecting ducts to water.t is produced in the hypothalamus and secreted from the posterior pituitary gland. Aldosterone increases the reabsorption of sodium ions into the blood in the loop of Henle and distal tubes.