Sexual reproduction in humans

Question 1

What happens on Day 14 of the menstrual cycle

Answer 1

Graafian follicle rupture ; ovum released

Question 2

When does fertilisation occur

Answer 2

from day 11-17

Question 3

What happens from day 17-28

Answer 3

lining thickens to get ready for implantation

Question 4

What is the role of FSH

Answer 4

• stimulates development of follicles ; secreting oestrogen

Question 5

What is the role of oestrogen

Answer 5

• stimulates pituitary gland to secrete LH
• stops secretion of FSH
• repair & growth of Endometrium

Question 6

What is the role of LH

Answer 6

• peaks at ovulation ( day 14 )
  stimulates follicle to burst & release egg
• causes formation of corpus luteum ; secreting oestrogen & progesterone

Question 7

What is the role of progesterone

Answer 7

• causes endometrium to thicken with blood vessels filling with fluids & nutrients ; nourishing embryo

Question 8

What are the functions of amnion & amniotic fluid

Answer 8

• protect the foetus from physical damage
• provides stable environment ; reducing temperature fluctuations
• allows foetus to move freely
• lubricates vagina ; reducing friction at birth

Question 9

What are the functions of the placenta

Answer 9

• nutrients & oxygen diffuse into foetal blood and are carried along the umbilical vein
• CO2 & metabolic wastes are carried along the umbilical artery
• allows maternal antibodies to diffuse from maternal blood to foetal blood