Sexual reproduction in humans Flashcards

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1
Q

What happens on Day 14 of the menstrual cycle

A

Graafian follicle rupture ; ovum released

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2
Q

When does fertilisation occur

A

from day 11-17

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3
Q

What happens from day 17-28

A

lining thickens to get ready for implantation

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4
Q

What is the role of FSH

A
  • stimulates development of follicles ; secreting oestrogen
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5
Q

What is the role of oestrogen

A
  • stimulates pituitary gland to secrete LH
  • stops secretion of FSH
  • repair & growth of Endometrium
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6
Q

What is the role of LH

A
  • peaks at ovulation ( day 14 )
    stimulates follicle to burst & release egg
  • causes formation of corpus luteum ; secreting oestrogen & progesterone
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7
Q

What is the role of progesterone

A
  • causes endometrium to thicken with blood vessels filling with fluids & nutrients ; nourishing embryo
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8
Q

What are the functions of amnion & amniotic fluid

A
  • protect the foetus from physical damage
  • provides stable environment ; reducing temperature fluctuations
  • allows foetus to move freely
  • lubricates vagina ; reducing friction at birth
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9
Q

What are the functions of the placenta

A
  • 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
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