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Urinalysis - Chapter 2 Terms
Renal Function
14
Medical
Undergraduate 2
10/09/2010

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Term
Active transport
Definition
Movement of a substance across cell membranes into the bloodstream by electrochemical energy
Term
Aldosterone
Definition
A hormone that regulates reabsorption of sodium in the distal convoluted tubule
Term
Maximal reabsorptive capacity
Definition
The maximum reabsorption ability for a solute by renal tubules
Term
Osmolarity
Definition
The osmotic pressure of a solution expressed in milliosmols per kilogram; it is affected only by the number of particles present
Term
Passive transport
Definition
Movement of molecules across a membrane by diffusion because of a physical gradient
Term
Podocytes
Definition
Epithelial cells of the inner lining of Bowman's capsule that contain footlike processes
Term
Renal threshold
Definition
Plasma concentration of a substance at which active transport stops and increased amounts are excreted in the urine
Term
Renal tubular acidosis
Definition
The inability to produce an acidic urine in the presence of metabolic acidosis
Term
Renin
Definition
Proteolytic enzyme produced by the kidney that reacts with angiotensinogen to produce angiotensin to increase blood pressure
Term
Renin-angiotensin-aldosterone system
Definition
Regulates flow of blood to and within the kidneys by responding to changes in blood pressure and plasma sodium content
Term
Titratable acidity
Definition
Hydrogen ions in the urine that canbe quantitated by titration with a base to a pH of 7.4
Term
Tubular reabsorption
Definition
Substances moved from the tubular filtrate into the blood by active or passive transport
Term
Tubular secretion
Definition
The passage of substances from the blood in the peritubular capillaries to the tubular filtrate
Term
Vasopressin
Definition
Antidiuretic hormone that regulates reabsorption of water by the collecting ducts
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