Lesson 5: fertilisation and pregnancy

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 1

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-hw menstrual cycle

HW sheet 1

Reproduction

Lesson 5: Fertilisation and Pregnancy 

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

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

How do cells multiply? 

Body cells

'clones'

Sex cells

sperm and egg 'different'

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

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)

Study quizlet reproduction

(individually)

After -> quizlet live! 

Start working!

• HW for lesson 6 - Fertilisation and pregnancy
  

Next lesson: Contraceptives

Next week: Glossary quiz!!