Post by Admin on Nov 21, 2016 12:01:00 GMT
Reproduction
Reproduction is the production of a new individual of the same species.
• A gamete is a sex cell.
• Sexual reproduction is the fusion of a male and female gamete.
• The male gamete is the sperm.
• The female gamete is the egg.
The Male Reproductive System
• Testes: produce sperm
• Sperm is mixed with seminal fluid to form semen.
• Seminal vesicle: produces the seminal fluid.
The Female Reproductive System
• The egg is made in the ovary
• Eggs are released every month until the menopause.
The Menstrual Cycle
• An egg is released from the ovary every 28 days.
• The release of an egg from the ovary is called ovulation.
• In days 1-5 of the menstrual cycle the lining of the uterus breaks down(menstruation).
• In days 6-12 the womb lining builds up again.
• In days 13-15 ovulation occurs.
• In days 16-28 the lining of the uterus stays built up.
• The fertile period is the time in the menstrual cycle when the woman is most likely to become pregnant if she has intercourse. The fertile period lasts from day 11 to day 18.
Fertilisation
• Fertilisation is the fusion of a male and female gamete.
• The fusion of the male and female gametes forms a zygote.
• After an egg has been fertilised it attaches itself to the lining of the uterus. This is called implantation.
Pregnancy
• The average length of human pregnancy is 40 weeks.
• During pregnancy the placenta allows food and oxygen to pass into the baby's blood, and wastes to pass into the mother's blood.
• The embryo is protected by amniotic fluid.
• Contraception is a means by which fertilisation is prevented.
Reproduction is the production of a new individual of the same species.
• A gamete is a sex cell.
• Sexual reproduction is the fusion of a male and female gamete.
• The male gamete is the sperm.
• The female gamete is the egg.
The Male Reproductive System
• Testes: produce sperm
• Sperm is mixed with seminal fluid to form semen.
• Seminal vesicle: produces the seminal fluid.
The Female Reproductive System
• The egg is made in the ovary
• Eggs are released every month until the menopause.
The Menstrual Cycle
• An egg is released from the ovary every 28 days.
• The release of an egg from the ovary is called ovulation.
• In days 1-5 of the menstrual cycle the lining of the uterus breaks down(menstruation).
• In days 6-12 the womb lining builds up again.
• In days 13-15 ovulation occurs.
• In days 16-28 the lining of the uterus stays built up.
• The fertile period is the time in the menstrual cycle when the woman is most likely to become pregnant if she has intercourse. The fertile period lasts from day 11 to day 18.
Fertilisation
• Fertilisation is the fusion of a male and female gamete.
• The fusion of the male and female gametes forms a zygote.
• After an egg has been fertilised it attaches itself to the lining of the uterus. This is called implantation.
Pregnancy
• The average length of human pregnancy is 40 weeks.
• During pregnancy the placenta allows food and oxygen to pass into the baby's blood, and wastes to pass into the mother's blood.
• The embryo is protected by amniotic fluid.
• Contraception is a means by which fertilisation is prevented.