Human Reproduction Flashcards
Egg
The female sex cell
Has half of DNA
Sperm
Male sex cell
Has half of DNA
Zygote
When the egg cell and sperm cell fuse
Embryo
When the zygote divides
Foetus
When the foetus has noticeable human features
8 weeks ➡️
When a woman releases an egg from her ovaries it is called
Ovulation
Name of organ that connects baby to mother
Umbilical cord
Is the tube that connects placenta to baby
What is the placenta?
The organ where things are exchanged between mother and baby to keep baby growing
Name two things that happen to only girls during puberty
1) Menstruation begins
2) Hips widen
Name two things that only happen to boys during puberty
1) penis grows
2) begins to grow facial and chest hair
What is amniotic fluid?
A fluid that protects the baby from harm as it develops in the womb
Why does the lining of the uterus shed every month?
If an egg drops down from the ovaries into the uterus, it expects to be fertilised and have a soft place to nest (the uterus). However if the egg is not fertilised within a few days, the lining and egg do not need to be there so they break down and are disposed of through the vagina.
Name the female reproductive organs and their functions
Ovaries -contains female sex cells called ova
Oviduct -the tube that arrives the egg to the uterus
Uterus -where the baby develops
Cervix -a ring 0f muscle which help hold the baby in place
Vagina -tube that lead from the cervix to outside the body
Name the male reproductive organs and their functions
Seminal Glands- have a fluid that provide sperm with nutrients but is not where sperm are made
Sperm duct-tube that sperm pass through to get to the penis
Penis- tube that passes out wee and sperm
Urethra- line down penis that keep the wee and sperm separate
Testes-produce millions of sperm and male male sex Hormon testosterone
How are identical twins formed?
Monozygotic twins are formed by one zygote (egg and sperm fused) which splits to form to embryos