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Lesson 5: fertilisation and pregnancy
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Biologie
Middelbare school
havo, vwo
Leerjaar 1
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Lesson duration is:
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-hw menstrual cycle
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HW sheet 1
Slide 2 - Slide
Reproduction
Lesson 5: Fertilisation and Pregnancy
Slide 3 - Slide
Learning goals lesson 5
-You know what gametes are
-You know the difference between an embryo and a fetus
-You know what the following structures are and can explain their function:
placenta, umbilical cord, amniotic sac
Slide 4 - Slide
Fertilisation
Gametes
are sex cells
sperm and egg (ova)
contain half the DNA of regular body cells
Fertilisation
= melting together of sperm and egg cell
Zygote
= 'baby cell' sperm and egg cell melted together
Embryo
= when cells starts to multiply
Slide 5 - Slide
Slide 6 - Slide
How do cells multiply?
Body cells
'clones'
Sex cells
sperm and egg 'different'
Slide 7 - Slide
Pregnancy
Placenta
spongy mass of blood vessels
transport oxygen, nutrients & carbon dioxide
Amniotic sac
membrane around the fetus filled with water
protects the fetus
Umbilical cord
connection placenta to fetus
Slide 8 - Slide
Childbirth
-Amniotic sac breaks
-after 9 months / 40 weeks
Muscles of the uterus contract
Dilation contractions - open up the cervix
Pushing contractions - uterus pushes the baby out
after 15 min. -> afterbirth (placenta + amniotic sac)
Slide 9 - Slide
Study quizlet reproduction
(individually)
After -> quizlet live!
timer
20:00
Slide 10 - Slide
Start working!
HW for lesson 6 - Fertilisation and pregnancy
Next lesson:
Contraceptives
Next week: Glossary quiz!!
Slide 11 - Slide
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