Question 19 The graph below shows the concentration of progesterone in a woman's
blood during the early stages of pregnancy.
Progesterone levels in a woman's blood
during the early stages of pregnancy
45
40
35
39,5
30
33,4
25
26,2
28
30
Progesterone level (ng/ml)
21,6
20
15
10
IU
0
4
6
8
10
Gestation period (weeks)
12
14
19.1
Name TWO structures responsible for producing progesterone
during pregnancy.
(2)
19.2
Describe the general trend in the change in progesterone levels in
the woman's blood during the early stages of pregnancy.
(1)
19.3
Describe the negative feedback mechanism that occurs between
progesterone and FSH during pregnancy.
(2)
19.4.
State the importance of the negative feedback mechanism
described in QUESTION 19.3.
19.5
(3)
Calculate the percentage increase in progesterone levels between
Week 4 and week 14. Show ALL calculations.
19.6
The woman's progesterone level in week 16 was 25 ng/ml.
(2)
(a) Explain why this woman should be concerned about the
decrease in progesterone levels,
(1)
(12)
(b) Suggest ONE way in which this problem could possibly be
treated by a doctor.​