The kidneys of a healthy adult receive 1100 mL of blood a minute…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The kidneys of a healthy adult receive mL of blood a minute. The formed elements are of the blood. The GFR is mL/min. The plasma volume of the body is L.
- How much plasma flows through the kidneys in a minute?
- What per cent of this plasma is filtered?
- How many times in a day is a volume of plasma equal to the whole plasma of the body filtered?
Need a reminder? The key ideaShow
Urine forms by filtration, reabsorption and secretion. The glomerular filtration rate (GFR) is about mL/min, which is L a day. About of the filtrate is reabsorbed, and about L of urine is passed. The PCT takes back all the essential nutrients and to of the electrolytes and water. The kidneys receive to mL of blood a minute. The tubule secretes H, K and ammonia.
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. Blood: mL/min. Formed elements: . GFR: mL/min. Plasma volume: L.
Plan. Find the plasma flow, then the filtration fraction. Then compare the filtrate in a day with the plasma volume.
Step 1. Plasma flow. mL/min.
Step 2. Filtration fraction. .
Step 3. Times in a day. Filtrate: L. times.
Answer: mL/min; ; times.
Check. The kidneys filter about a fifth of the plasma that they receive, and most of it returns to the blood in the tubules.
Source. Guyton and Hall, Textbook of Medical Physiology, 14th edition, chapter on glomerular filtration. The idea of the filtration fraction is not in the NEET syllabus text.
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