12. What event marks the
beginning of the menstrual
cycle? What is the blood
concentration of FSH, LH,
estrogen and progesterone in
this phase of the cycle?

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
By convention the menstrual
begins at the day menses begins.
(Menses is endometrial hemorrhage
excreted through vaginal canal.) At
these the hormones FSH, LH,
and progesterone are in
concentration.