Hormones, the menstrual cycle and reproduction

Table 1 shows the concentration of oestrogen in the blood of an adult female during different phases of a 28-day menstrual cycle.

Days in the cycle	Oestrogen concentration (pmol/L)
1–5	110
6–12	290
13–15	920
16–23	450
24–28	130

Describe the changes in the oestrogen concentration during the 28-day cycle.

[2]

Table 1 shows the concentration of oestrogen in the blood of an adult female during different phases of a 28-day menstrual cycle.

Days in the cycle	Oestrogen concentration (pmol/L)
1–5	110
6–12	290
13–15	920
16–23	450
24–28	130

Describe the changes in the oestrogen concentration during the 28-day cycle.

[2]

Hormones, the menstrual cycle and reproduction Questions