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Renal Physiology: Tubular Reabsorption and Secretion

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Renal Physiology: Tubular Reabsorption and Secretion

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Questions and Answers

What is the formula for calculating the amount of substance filtered per day?

Filtrated load = GFR $-$ concentration of substance in plasma

Filtrated load = GFR $\div$ concentration of substance in plasma

Filtrated load = GFR $\times$ concentration of substance in plasma (correct)

Filtrated load = GFR $+$ concentration of substance in plasma

What percentage of sodium is reabsorbed by the kidneys?

100%

99.4% (correct)

50%

99.9%

Which substance has the highest amount excreted by the kidneys?

Glucose

Creatinine

Bicarbonate

Urea (correct)

What is the percentage of chloride reabsorbed by the kidneys?

<p>99.1%</p> Signup and view all the answers

What is the average amount of plasma reabsorbed out of 180 litres filtered per day?

<p>$178.5$ litres</p> Signup and view all the answers

Study Notes

Kidney Function and Filtration

The formula for calculating the amount of substance filtered per day is not provided.
The kidneys reabsorb approximately 99.5% of sodium.
The kidneys excrete the highest amount of urea.
Chloride is reabsorbed by the kidneys at a rate of around 98-99%.
On average, the kidneys reabsorb around 179 litres of plasma out of 180 litres filtered per day, leaving only about 1 litre of plasma to be excreted.

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Description

This quiz covers the renal processes of tubular reabsorption and secretion, including the modes of transport involved such as active and passive transport. It also explains the tubular process of the glomerular filtrate, focusing on reabsorption (the passage of substances from the tubular lumen to peritubular capillaries) and secretion (the addition of substances to the tubular fluid from blood).