Human reproduction Flashcards
Menstrual Cycle
Day1: Menstruation– the uterus lining is broken down if there is no fertilised egg, causing bleeding.
Day 4: The lining of the uterus begins to build back up in preparation for a fertilised egg.
Day 14: Ovulation – an egg is released from the ovary and travels down the oviduct into the uterus.
Day 28: The wall is maintained for
14 days until day 28. If there is no fertilised egg on the lining of the uterus then the menstrual cycle will begin again.
Puberty.
The gradual change of bodies as their enter childhood.
Males- Testosterone starts to be produced in the testes and produces secondary sexual characteristics such as the development of sexual organs, growth of facial, pubic and underarm hair and voice breaks as their voice gets deeper
Female- oestrogen starts to be produced in the ovaries and produces secondary sexual characteristics such as the development of breasts and sexual organs, growth of pubic and underarm hair and the widening of hips.
What is the role of luteinising hormone in the menstrual cycle? Where is it released from?
LH causes the egg to be released from the ovaries / ovulation.
It is released from the pituitary gland.
Explain how contraceptive pills reduce the chance of pregnancy.
Contraceptive pills contain oestrogen and progesterone.
These hormones inhibit the production of FSH.
So eggs cannot mature in the ovaries and so eggs cannot be fertilised by sperm.
