10 Questions
What is the term for the process by which solutes move back into the renal tubule system?
Secretion
Which process increases the volume of urine produced?
Diuresis
What is the term for the process by which solutes are reabsorbed into the vascular system?
Reabsorption
Which process increases the excretion of solute-free water?
Aquaretic
What is the term for the process by which the kidney increases sodium excretion?
Naturesis
What is primarily reabsorbed in the Proximal Convoluted Tubule?
Glucose, bicarbonate, amino acids, and other metabolites
What is a unique feature of the Proximal Convoluted Tubule?
High rate of O2 consumption
What is secreted by the Proximal Convoluted Tubule?
Organic acids, such as bile salts and uric acid
What is the location of the Proximal Convoluted Tubule?
Cortex
What percentage of filtered Na+ and water is reabsorbed in the Proximal Convoluted Tubule?
65%
Study Notes
Renal Processes
- Reabsorption: the process by which solutes are reabsorbed into the vascular system
- Secretion: the process by which solutes move back into the renal tubule system
Regulation of Urine Composition
- Diuresis: a process that increases the volume of urine produced
- Naturesis: a process that increases renal sodium excretion
- Aquaretic: a process that increases the excretion of solute-free water
Proximal Convoluted Tubule (PCT)
- Located in the cortex of the kidney
- Responsible for reabsorbing most of the glucose, bicarbonate, amino acids, and other metabolites
- Secretes organic acids, including bile salts, uric acid, catecholamines, toxins, NSAIDS, and antibiotics
- Reabsorbs 65% of filtered Na+ and water
- Highly permeable to water, which maintains a constant osmolality with the interstitial fluid
- Has the highest rate of O2 consumption among kidney structures
Test your knowledge of renal physiology terms, including reabsorption, secretion, diuresis, naturesis, and aquaretic processes.
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