Quiz 1

The graph shows the levels of two hormones involved in the menstrual cycle over a two month period. Examine the graph carefully and answer the questions below.

GRAPH SHOWING THE CONCENTRATION OF TWO SEX HORMONES IN THE BLOOD OF AN INDIVIDUAL WITH A REGULAR 28-DAY MENSTRUAL CYCLE

Describe briefly the changes which would be taking place in the ovary and the uterus between days 5 and 17 of the menstrual cycle. (7 marks)

Shade TWO periods on the graph during which menstruation really takes place. (2 marks)

State ONE day of the cycle on which sexual intercourse could lead to pregnancy. Give ONE reason for your answer.(2 marks) 

How are the levels of the two hormones at day 28 of the first cycle different from the levels at day 28 of the second cycle? Give ONE explanation for the difference you describe. (6 marks)


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