4.6 Pregnancy

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

4.6 pregnancy

learning objectives

• what is cleavage and where does it take place?
• what is implantation and why is this process needed for a healthy embryo to form?
• what structures are there to nourish and support the developing foetus? 

what and where is cleavage? 

7 days after fertilisation there is the implantation of the embryo; 

on what day number? 

zygote -> morula-> blastocyst -> embryo

what is cleavage?
(choose the best answer)

1. cell divisions during which the zygote grows into a tiny hollow ball of cells
2. cell divisions of the zygote in the oviduct until implantation
3. cell division during which the embryo grows into the first foetal stage
4. cell divisions during which the zygote grows into an foetus

implantation 

different stages - different names 

zygote = fertilised egg

embryo = 32 cell stage after cleavages, at implantation 

foetus = 10 weeks of pregnancy, the beginning of all organs are present. From now these only have to grow and develop. 

After .... weeks of pregnancy the embryo is called foetus

1. 8
2. 9
3. 10

Pregnany lasts for ... weeks after fertilisation

1. 38
2. 39
3. 40
4. 41

The earliest moment a neonatal can be given birth to is after ... weeks of pregnancy

1. 23
2. 24
3. 25
4. 26

It can't be be born earlier because ...

1. The lungs are underdeveloped so it cannot breath
2. The heart can't beat by itself
3. The neonatal does not have teeth in order to eat
4. the mother cannot breast feed the neonatal

the placenta belongs to ..

1. the mother
2. the foetus
3. both mother and foetus

synonym to foetal diagnosis is ...

1. postnatal check
2. postnatal screening
3. prenatal screening
4. prenatal check

homework

learn par. 4.6 Pregnancy

finish exercises 1-7 

exit ticket  

what did you learn about foetal development?

how could prenatal screening help to detect an unborn with Down's  Syndrom?