Suppose that a placenta passes 24 mL of oxygen to the foetus 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.
Suppose that a placenta passes mL of oxygen to the foetus every minute.
- How much oxygen does it pass in one hour?
- How much oxygen does it pass in hours?
Need a reminder? The key ideaShow
The placenta forms from the chorionic villi of the trophoblast and the tissue of the uterus. It passes oxygen and nutrients to the embryo and takes carbon dioxide and waste away. The placenta makes hCG, hPL, oestrogens and progestogens. The ovary secretes relaxin in the later phase of pregnancy. hCG, hPL and relaxin are made only in pregnancy. The blood of the mother and the blood of the embryo do not mix.
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. Rate: mL each minute.
Plan. Change the hours to minutes, then multiply.
Step 1. One hour. mL.
Step 2. Three hours. mL.
Answer: mL; mL.
Check. The second answer is three times the first, as it should be for three times the time.
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