Section L: Human Reproduction (Menstrual cycle (Day 1 – 7 - The…
Section L: Human Reproduction
Sex cells are called gametes
Male gametes are called sperm
Female gametes are called eggs
effect of Testosterone in males
Hair grows on face and body
sperm production begins
more muscular body
genitals grow and develop
Effect of Oestrogen in females
pubic hair and hair under arms grow
levels of hormones
causes the lining of the uterus to thicken and grow
stimulates the release of an ovum at day 14
maintains the lining of the uterus. when levels of progesterone falls the lining breaks down.
Female reproductive system
male reproductive system
Day 1 – 7
- The menstruation cycle starts with the first day of a woman’s period. This is the name given to the time of the month when the lining of the uterus comes away and exits through the vagina as blood.
Approximately 28 days
Day 7 – 13
- Around day 7 the blood flow stops. The lining of the uterus begins to build up again. At this time an egg starts to mature in one of the ovaries
Day 14 (The Middle)
- On the 14th day which is the middle of the cycle, an egg is released by an ovary into the oviduct.
Day 14 – 17
- The egg can last up to 3 days after it is released from the ovary. - During this time the egg travels down the oviduct and into the uterus hoping to be fertilised.
Day 18 – 28
- If the egg is not fertilised then the lining of the uterus begins to break down.
then the cycle starts over again
Fertilisation key words
- cells surrounding a developing egg
- fallopian tube where fertilisation occurs
- fusing of a sperm and egg nucleus in the oviduct
- fertilised egg
- when the zygote divides to me more than one cell
- when the embryo reaches the uterus and embeds into the lining
- an organ where material can be exchanged between the mother and foetus
First mammal to be successfully cloned was a sheep called Dolly in1996
1 - the nucleus of a sheep's egg is removed creating an
2 - A diploid nucleus is inserted in its place (from a mature udder cell)
3 - the cell was stimulated by an electric shock so it would start dividing by mitosis, as if it was a normal fertilised egg.
the dividing egg was implanted into the uterus of another sheep to develop until it was ready to be born