top left
Endometriosis causes cells from the lining of the uterus to travel to other areas such as the ovaries and tubes, which can affect fertility.
top right
Here, a special dye injected through the cervix reveals a blockage in the left
fallopian tube since the dye has been unable to enter the tube.
bottom left
If the head,or cap, of the sperm is
abnormally shaped it will be
unable to fertilize an egg.
bottom right
In polycystic
ovary syndrome, cysts in the
ovaries mean that the follicles
are unable to mature and
produce ripened eggs