Fertilization & Pregnancy

Question 0

what does the sperm do when it finds the egg

Answer 0

-head penetrates the cell membrane of the egg which immediately hardens

Question 1

how does fertilization affect the menstrual cycle

Answer 1

interrupts it

Question 2

how many chromosomes do the sperm and egg cell have

Answer 2

• both have 23

- both fuse nucleus and for a zygote

Question 3

where does the zygote go

Answer 3

it drifts into the uterus and divides by mitosis

Question 4

what happens six days after the zygote

Answer 4

• it becomes a ball of hundreds of cells and is now an embryo
• reaches the uterus and implants into the thickened lining
• woman is officially pregnant

Question 5

what does the embryo grow and develop

Answer 5

• inner layers become baby

- outer layers become supporting tissues like placenta and umbilical cord

Question 6

what is the placenta

Answer 6

temporary organ that supplies the growing baby with nutrients and gets rid of waste by being closely connected to the mother’s own blood supply

Question 7

how is the baby connected to the placenta

Answer 7

• umbilical cord

- after baby is born the umbilical cord is cut of leaving a permanent scar called the navel or belly button