The diagram shows the changes in the thickness of the uterus lining of a woman during her menstrual cycle.

At which time is the woman most likely to be fertile?

What is the sequence of structures through which a mammalian sperm passes after leaving the penis and before fusing with an ovum?

On which date is a woman most likely to ovulate if the first day of menstrual loss was 1 February?

What are the functions of LH and FSH in the menstrual cycle?

produces the fluid part of semen? A

After sexual intercourse, sperm can survive for 3 days in the uterus and oviducts.

Ovulation can occur any time from day 13 to day 15 and an egg cell can live for 2 days after ovulation.

How long is the longest possible fertile phase of the menstrual cycle?

In which region are sperms released during sexual intercourse and where does fertilisation usually take place?

How are sperm cells different from egg cells in size and in number?

The graph shows the concentration in the blood of three of the four hormones FSH, LH, oestrogen and progesterone.

Which hormone is not shown?