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Figure shows some of the changes that occur throughout the phases of a menstrual cycle. For each of the physiological variables a–e below, select the most appropriate option from the following list of traces. 1. Trace A. 2. Trace B. 3. Trace C. 4. Trace D. a. Oestradiol level. b. Core temperature. c. Luteinizing hormone level. d. Progesterone level. e. Inhibin level. |
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Answer» a. Option 3 Trace C. Oestrogens produced by the follicular cells of the developing ovum dominate the follicular phase of the cycle and peak about the time of ovulation; the level is still somewhat raised during the luteal phase. b. Option 1 Trace A. Core temperature tends to rise about the time of ovulation and then falls again coming up to the following menstruation. c. Option 4 Trace D. Luteinizing hormone secretion peaks at about the time of ovulation (in a similar manner to follicle-stimulating hormone, but its concentration tends to be greater). d. Option 2 Trace B. Progestogens formed by the corpus luteum dominate the luteal phase of the cycle and cause the endometrium to enter the secretory phase. e. Option 2 Trace B. Inhibin is a hormone produced by the ovary that inhibits secretion of follicle-stimulating hormone by the anterior pituitary gland. It peaks in the luteal phase of the cycle with a time course similar to the progestogen level. |
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