4.6 Pregnancy

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

One + one = three

Benodigheden

- iPad

- Pen, pencil

- note book

- binder

For a mark

- No

Lessonup

- Yes

Phones 

in phone closet/bag

today''s program 

review par. 4.5, homework check

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

These cell divisions are called cleavage.

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 

Theprocess of sinking into the endometrium is called 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. 

amniotic sac

On which day in the menstrual cycle is the implantation of the fertilized egg?

1. Between day 5-10
2. Between day 10-15
3. Between 15-20
4. Between 20-25

Which hormone prepares the uterus wall for implantation of the ferilized egg?

1. Oestrogen
2. Progesteron
3. FSH
4. LH

What is NOT a function of the amniotic sac?

1. it acts as a cushion to protect the foetus
2. it stores nutrients and waste from the foetus
3. it contains the pigments to tan the skin of the foetus
4. it keeps the temperature in the amniotic sac less variable

huiswerk

lrn par 4.6 

do exercises 1-4 of par. 4.6

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

exit ticket  

what did you learn about foetal development?

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