The kidneys of a healthy man receive 1150 mL of blood every 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 man receive mL of blood every minute. His heart pumps mL a minute.
- How many litres of blood pass through his kidneys in one hour?
- How many litres pass through in one day?
- What per cent of the cardiac output goes to the kidneys?
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. Kidney flow: mL/min. Cardiac output: mL/min.
Plan. Multiply the flow by the time, then change to litres.
Step 1. One hour. mL L.
Step 2. One day. mL L.
Step 3. The share. .
Answer: L; L; .
Check. The share is one fifth, which agrees with the statement in NCERT that the kidneys receive roughly a fifth of the cardiac output.
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