science Flashcards
skibidaid (28 cards)
ovulation
the process where a mature egg is released from an ovary, ready to be fertilised
fertilisation
process where the sperm and the ovum fuse in one of the oviducts and form a zygote
cell division
process where new cells are formed for growth, repair and replacement in the body
implantation
the attachment of a fertilised egg to the wall of the uterus at the start of pregnancy
placenta
an organ in the uterus which nourishes and provides vital nutrients for the foetus via the umbilical cord
what things does the placenta exchange?
mother provides:
oxygen
water
vitamins
drugs (some)
viruses (almost all)
nutrients
baby:
carbon dioxide
water
waste products
uterus
if the egg is fertilised, it implants on the wall of the uterus and develops into a foetus
cervix
neck or opening of the uterus
vagina
connects cervix to outside of the body
ovum
female sex cell
ovary
after puberty, ovum is released from the ovary once every 28 days
oviduct
carries the ovum from the ovary to the uterus - egg is fertilised there
sperm
male sex cell
testes
produce sperm
scrotum
skin which holds the testes
urethra
tube through which urine leaves the body
gland
provides nutrients to the sperm
pollination
the act of transferring pollen grains from the male anther of a flower to the female stigma
sepal
protect & support flower
anther
produces male sex cells (pollen)
stigma
traps pollen
ovary
produces ovules
style
where the pollen tube grows down to ovules
insect pollination
- bright petals to attract insects
- scented with nectar
- moderate amount of pollen
- sticky pollen grains
-anthers are stiff and firmly attached - stigma inside to get pollen grains stuck
