Lab Exercise 8.5.1 - Hormone levels during the Menstrual Cycle
* Please note: your answers may not be exactly as written here. As long as you
can justify your answer and it is logical, you will not lose marks!*
Analysis
a.
b.
c.
d.
Hormone X is FSH; hormone Z is LH.
Hormone W is estrogen; Y is estrogen and progesterone.
W (estrogen) and Y (estrogen & progesterone).
See below:
e. Day 14 is ovulation day.
f. The temperature decreases before ovulation and rises above normal body
temperature during ovulation.
g. Body temperatures with a functioning corpus luteum are higher than those
without.
h. Ovulation occurs at X and menstruation occurs at Z.
i. Estrogen is being produced at W and Y.
j. Estrogen and progesterone are produced by the corpus luteum at Y.
k. LH increases progesterone and estrogen levels by stimulating the formation
of the corpus luteum. The corpus luteum produces both female sex
hormones.
Synthesis
l.
i.) Ovulation would occur at X when the secretion of estrogen is at a peak,
with little progesterone present.
ii.) A functioning corpus luteum would be present at Z, when both estrogen
and progesterone are present
m. The triplets may have come from a single egg. Identical triplets are formed by
a single egg splitting. If the triplets were fraternal, three separate corpus
lutei, indicating three eggs, may have been found.
n. & o. Answers will vary. Surprise me!