Hormones, the menstrual cycle and reproduction

Table 1 shows the concentration of progesterone in a woman's bloodstream at different stages of her 28-day menstrual cycle.

Days in menstrual cycle	Average progesterone level (nmol/L)
1–13	1.1
14	1.5
15–22	26.8
23–28	6.4

Explain why the progesterone level increases significantly after day 14.

[2]

Table 1 shows the concentration of progesterone in a woman's bloodstream at different stages of her 28-day menstrual cycle.

Days in menstrual cycle	Average progesterone level (nmol/L)
1–13	1.1
14	1.5
15–22	26.8
23–28	6.4

Explain why the progesterone level increases significantly after day 14.

[2]

Hormones, the menstrual cycle and reproduction Questions