explain in brief the tubular secretion , an important step of urine formation.
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Urine formation is an important process used for the body to rid itself of metabolic wastes and toxins via the kidneys. If urine formation is disrupted for an extended period of time, toxins will begin to build up in the body causing serious bodily harm or even death (St. Hilaire, 2015). Urine is formed through four basic processes: glomerular filtration, tubular reabsorption, tubular secretion and water conservation (St. Hilaire, 2015).
Glomerular filtration: The first stage in urine formation. This is the process in which water and other substances in the blood plasma (electrolytes, glucose, fatty acids, amino acids, nitrogenous wastes, and vitamins) pass from the capillaries of the glomerulus into the Bowman’s capsule. This stage must be controlled because if filtration is too high, reabsorption of the required water and solutes. If filtration is too low, the wastes that should be eliminated are reabsorbed.
Tubular reabsorption: The second stage in urine formation. This is the process of reclaiming water and other substances (sodium, glucose, nitrogenous wastes) from the tubular fluid. After these substances leave the surface of the renal tubule, they are reabsorbed by the capillaries into the blood stream.
Tubular secretion: The third stage in urine formation. This is the process of removing chemicals from the blood and secreting them into the tubular fluid. This helps to remove wastes and plays a core role in acid-base balance.
Water conservation: The fourth and final stage of urine formation. The kidneys not only dispose of wastes but they prevent the body from losing too much water. If the body loses too much water, dehydration will occur. Water is reabsorbed into the blood stream by osmosis. The amount of urine produced in the end is based upon the amount of fluid in the body. The more water a person intakes in a day, the more urine they will urinate.
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Glomerular filtration: The first stage in urine formation. This is the process in which water and other substances in the blood plasma (electrolytes, glucose, fatty acids, amino acids, nitrogenous wastes, and vitamins) pass from the capillaries of the glomerulus into the Bowman’s capsule. This stage must be controlled because if filtration is too high, reabsorption of the required water and solutes. If filtration is too low, the wastes that should be eliminated are reabsorbed.
Tubular reabsorption: The second stage in urine formation. This is the process of reclaiming water and other substances (sodium, glucose, nitrogenous wastes) from the tubular fluid. After these substances leave the surface of the renal tubule, they are reabsorbed by the capillaries into the blood stream.
Tubular secretion: The third stage in urine formation. This is the process of removing chemicals from the blood and secreting them into the tubular fluid. This helps to remove wastes and plays a core role in acid-base balance.
Water conservation: The fourth and final stage of urine formation. The kidneys not only dispose of wastes but they prevent the body from losing too much water. If the body loses too much water, dehydration will occur. Water is reabsorbed into the blood stream by osmosis. The amount of urine produced in the end is based upon the amount of fluid in the body. The more water a person intakes in a day, the more urine they will urinate.
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