Transport maximum
Transport maximum (Tm)
Transport maximum (pronunciation: trans-port max-i-mum) refers to the maximum rate at which a substance can be reabsorbed by the kidney tubules. This term is often used in the context of renal physiology.
Etymology
The term "Transport maximum" is derived from the English words "transport" and "maximum". "Transport" comes from the Latin transportare, meaning "to carry across", and "maximum" is from the Latin maximus, meaning "greatest".
Definition
Transport maximum is the upper limit to the amount of a substance that can be reabsorbed from the glomerular filtrate per minute by the renal tubules and collecting ducts. When the concentration of a substance in the filtrate exceeds the transport maximum, the excess is excreted in the urine.
Related Terms
- Renal threshold: The concentration of a substance dissolved in the blood above which the kidneys begin to remove it into the urine.
- Glomerular filtration rate (GFR): The volume of fluid that the kidneys filter from the blood per unit time.
- Tubular reabsorption: The process by which solutes and water are removed from the tubular fluid and transported into the blood.
- Tubular secretion: The transfer of materials from peritubular capillaries to the renal tubular lumen.
See Also
External links
- Medical encyclopedia article on Transport maximum
- Wikipedia's article - Transport maximum
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