The first day of a woman's menstruation is the 3rd of March…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The first day of a woman's menstruation is the rd of March. Her cycle lasts days, and the rd of March is day .
- On which date in March does she ovulate?
- On which date in March does her next menstruation begin?
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
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. Day is the rd of March. Cycle: days.
Plan. Find the day number, then count from the rd of March.
Step 1. Ovulation. It is on day . Day is the rd, so day is the th of March.
Step 2. Next menstruation. It starts days after the rd, which is the st of March.
Answer: the th of March; the st of March.
Check. There are days between the rd and the th, and days from the th to the st. The whole span is days.
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