Reproduction, Development and Health Education
What you must understand
Know the male and female reproductive systems and their functions. Understand gametogenesis: spermatogenesis and oogenesis, and the hormones involved (testosterone, oestrogen, progesterone, FSH, LH). Know the menstrual cycle phases (follicular, ovulation, luteal) and the role of the corpus luteum. Understand fertilisation (in the fallopian tube), cleavage, implantation, and the function of the placenta. Know the main stages of embryonic development and the difference between internal and external fertilisation. In health education, understand sexually transmitted infections (HIV/AIDS, gonorrhoea, syphilis), contraception methods, and the importance of prenatal care and vaccination.
Traps that appear in questions
- Saying fertilisation occurs in the uterus - it normally occurs in the fallopian tube.
- Confusing the roles of oestrogen (follicle development, endometrial thickening) and progesterone (maintaining the endometrium).
- Forgetting that the placenta allows exchange of nutrients and gases but does not mix maternal and fetal blood.
- Mixing up ovulation (release of the egg) with menstruation (shedding of the endometrium).
- Assuming HIV is transmitted by casual contact - it is not.
Worked example
In a 28-day cycle, ovulation typically occurs around day 14. Before ovulation, oestrogen rises and triggers the LH surge; after ovulation, the corpus luteum secretes progesterone to maintain the endometrium. Rule of thumb: oestrogen peaks before ovulation, progesterone peaks after.