Three women have regular cycles of different length…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
Three women have regular cycles of different length. For each, ovulation takes place days before the next menstruation.
- Woman A has a cycle of days. On which day does she ovulate?
- Woman B has a cycle of days. On which day does she ovulate?
- Woman C has a cycle of days. On which day does she ovulate?
Need a reminder? The key ideaShow
The average menstrual cycle lasts about days. The menstrual phase lasts to days. Ovulation takes place about days before the next menstruation, so in a cycle of days the day of ovulation is . The LH surge causes ovulation. The corpus luteum makes progesterone, which keeps the endometrium ready. If there is no fertilisation, the corpus luteum degenerates and menstruation begins.
The worked solution
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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. Cycles of , and days. Ovulation days before the next menstruation.
Plan. Subtract from the length of each cycle.
Step 1. Woman A. .
Step 2. Woman B. .
Step 3. Woman C. .
Answer: day ; day ; day .
Check. The longer cycle has the later ovulation. Only for a cycle of days is it on day .
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