A woman has her first menstruation at the age of 12 years, and her cycles stop at 51 years…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
A woman has her first menstruation at the age of years, and her cycles stop at years. She releases one ovum in each cycle. She has no pregnancy. Use days in a year.
- For how many years does she have cycles?
- How many ova does she release if every cycle lasts days?
- How many ova does she release if every cycle lasts days?
Need a reminder? The key ideaShow
An ovary is to cm long. The follicles lie in its cortex. The oviduct has the infundibulum, the ampulla and the isthmus. Fertilisation is in the ampulla. The wall of the uterus has the perimetrium, the myometrium and the endometrium. The reproductive life of a woman runs from the first menstruation to menopause, about years of age.
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. Age to years. Cycle: days or days.
Plan. Find the years, change them to days and divide by the cycle.
Step 1. Years. years.
Step 2. Days. days.
Step 3. Cycles of days. , so about ova.
Step 4. Cycles of days. , so about ova.
Answer: years; ova; ova.
Check. A longer cycle gives fewer cycles, so fewer ova. Both numbers are a few hundred, as the lesson says.
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