The kidneys of a healthy adult receive 1200 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. Both kidneys filter mL a minute.
- How much plasma flows through the kidneys in a minute?
- How much plasma flows through them in a day, in litres?
- What per cent of this plasma is filtered?
Need a reminder? The key ideaShow
The system has two kidneys, two ureters, a bladder and a urethra. A kidney lies between the last thoracic and the third lumbar vertebra. It has a capsule, an outer cortex and an inner medulla of cone shaped pyramids. The cortex runs between the pyramids as the renal columns. The notch is the hilum, and inside it lies the renal pelvis with its calyces. The kidneys receive to mL of blood a minute, roughly a fifth of the cardiac output.
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: . Filtrate: mL/min.
Plan. Find the plasma flow. Then compare the filtrate with it.
Step 1. Plasma in a minute. . mL/min.
Step 2. Plasma in a day. mL L.
Step 3. The share filtered. .
Answer: mL/min; L; .
Check. About a fifth of the plasma is filtered at each pass. You will use this idea in the next course.
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