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URL:https://www.learndesk.us/class/5691831830446080/lesson/c0fe8a0c35a187ec1bdcd9c15e8bff13?ref=outlook-calendar
SUMMARY:13.3 Formation of Urine
DTSTART;TZID=America/Los_Angeles:20260407T190000
DTEND;TZID=America/Los_Angeles:20260407T200000
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DESCRIPTION: 
Through the capillaries of the glomeruli, approximately 120 ml of water and salts are filtered from the blood each minute. Cells and plasma proteins are too large to pass through the capillary membranes into the renal tubule in a healthy nephron.
The filtrate contains glucose, salt, urea, uric acid, potassium, phosphates, sulfates, etc. in approximately the same proportions as blood plasma. However, the body must retain certain of these substances for fluid and electrolyte balance. Thus, as the filtrate passes along the tubule of the nephron, the filtrate is concentrated and essential substances are returned to the circulation via the second capillary network which surrounds the tubule. Most of the water is reabsorbed into the proximal convoluted tubules.
Essential or "high threshold" substances are also reabsorbed here, including glucose, sodium chloride, and amino acids, unless their concentration in the body is too high. "Medium threshold" substances such as potassium may be...

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STATUS:CONFIRMED
SEQUENCE:3
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