Human Reproduction Flashcards
what are sperm?
the male sex cell or gametes
where are sperm made?
the testes
what is ejaculated from the penis during sex?
semen which is sperm mixed with a liquid
what is an egg?
a female sex cell or a gamete
what releases an egg every 28 days?
ovaries
where does the egg go?
through the fallopian tubes and womb/ uterus
what might the egg meet?
sperm and it might be fertilised. if it isn’t fertilised it dies
What is the Menstrual cycle?
It’s the changes the uterus undergoes over a month
what is the 4 stages of the menstrual cycle?
STAGE 1: uterus breaks down (period)- Day 1-4
STAGE 2: lining of the uterus builds up ready for egg implantation- Day 4-13
STAGE 3: the egg is released - Day 14
STAGE 4: if no egg fertilised lining of uterus maintained until day 28/1
What are the 5 stages of fertilisation?
STAGE 1: Ovulation (egg released from a ovary)
STAGE 2: Copulation 9 sperm released from penis into vagina during intercourse
STAGE 3: fertilisation occurs in the fallopian tube( nuclei of egg and sperm join and become a zygote
STAGE 4: cell division- 24 hours after fertilisation the egg divides into 2 by 4 days its divided into 32 cells and is an embryo
STAGE 5: implantation- about 1 week after fertilisation the embryo starts to implant itself into the wall of the uterus and the placenta starts to develop
How long does gestation last?
about 39 weeks
At 1 month into gestation describe what the embryo is like.
about 6mm long and has a brain, heart, eyes, ears and legs
At 9 weeks into gestation describe what the embryo is like
about 25mm long and is completely formed. it is now called a foetus.
At 3 months into gestation what does the Foetus look like?
about 54mm long and looks more like a baby
At 5 months into gestation what is the foetus like?
about 160mm long. It kicks and finger nails can be felt
