HUMNNTR 2210 Lecture 9: Chapter 9
4 Aug 2018
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Document Summary
Water comprises 50% to 70% of the human body. Every cell, tissue, and organ contains some water. Water balance is controlled by electrolyte concentrations on either side of the cell membrane. Many different solutes can be dissolved in water. Metabolism generates wastes which dissolves in water and a excreted as part of urine. Water is a medium for chemical reactions. Takes much more energy to heat water than air. Because majority of body is water, much energy needed to change body temperature. Evaporation of perspiration from skin releases heat. Saliva, mucus, urine, respiratory tract, skin, eyes dehydration=digestion problem. Causes the kidney to decrease water excretion, which increases blood volume. From liver signals the adrenal glands to produce aldosterone and also directs the kidneys to. Angiotensin conserve sodium to increase decrease with age. The thirst mechanism can lag behind actual water loss during prolonged exercise and illness; Sick children, older persons and athletes need to drink plenty of uids.
