In the teaching model of the lesson, the level of LH in a natural cycle is 4 + 42 e^(-(d - 14)²)…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
In the teaching model of the lesson, the level of LH in a natural cycle is units on day , so there is a sharp peak on day . On the pill, the model keeps the level of LH at units on every day. The units are arbitrary.
- What is the level of LH on day in the natural cycle?
- What is the level of LH on day on the pill?
- How many times as high is the natural level as the level on the pill, to one decimal place?
- Which of the two cycles has an LH surge, and what follows it?
Need a reminder? The key ideaShow
The pills are taken for days, and then there is a gap of days. The pills keep FSH and LH low, so there is no LH surge and no ovulation. In a natural cycle the LH surge comes near day . Emergency methods are used within hours of coitus. Injectables and implants act like the pills for a longer time. Saheli is a non-steroidal weekly pill.
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. Natural: . On the pill: units.
Plan. Put in the first formula, and divide.
Step 1. Natural. , so the level is units.
Step 2. On the pill. units.
Step 3. The ratio. .
Step 4. The surge. The natural cycle has the surge, and ovulation follows it. On the pill there is no surge, so ovulation is not expected.
Answer: units; units; times; the natural cycle, followed by ovulation.
Check. On day or day the natural level is only units. The peak is narrow.
Watch out. This is a model with arbitrary units. Real hormone levels need blood tests, and they differ from person to person.
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