: Hormone Levels During the Menstrual Cycle

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Lab Exercise 8.5.1: Hormone Levels During the Menstrual Cycle

Analysis

1. Gonadotropic hormones regulate ovarian hormones. Study the feedback loop shown in Figure 4.

Figure 4 Feedback loop showing the regulation of ovarian hormones by gonadotropic hormones.

a) Identify as W, X, Y, or Z the two gonadotropic hormones represented in the diagram.

W and X represent the hormones, which stimulate the follicle-stimulating hormone – FSH, and YZ represents the thickening of the corpus luteum, which is done by the luteinizing hormone, this in turn produces progesterone (Y).

b) Identify the ovarian hormones shown in the diagram.

The ovarian hormone released by W and X is estrogen and progesterone is released by Y and Z.

c) Which two hormones exert negative feedback effects?

The two hormones that exert negative feedback effects are progesterone and estrogen.

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2. Body temperatures of two women were monitored during their menstrual cycles. One woman ovulated; the other did not. The results are shown in Table 4.

d) Graph the data provided on a separate piece of paper. Plot changes in temperature along the y-axis (vertical axis) and the days of the menstrual cycle along the x-axis (horizontal axis).

Graph found on the next page.

 e) Assuming this menstrual cycle represents the average 28-day cycle, label the ovulation day on the graph.

Graph found on the next page.

f) Describe changes in temperature ...

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