BS6 - Pregnancy

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Unit 4 - BS6 - Pregnancy

Today's lesson

1. Any Qs about the HW?
   
2. Learn Basics 6: pregnancy
3. Describe the fertilization of the human egg
4. Decribe how pregnancy progresses
5. Explain prenatal testing and give examples

what is fertilisation?

1. ovulation & ejaculation
2. egg cell waits 12-24h in oviduct; sperm cells swim to oviduct
3. sperm cell opens cell membrane of egg cell; cell membrane becomes impenetrable for the other sperm cells;
4. head  of sperm cell enters egg cell
5. fertilisation = nucleus of sperm cell fuses with nucleus egg cell. 

implantation 

1

Sperm enters the female body 

♂

2

Sperm swims through the uterus, towards the fallopian tubes.

♂

3

1 sperm cell can fertillize the ovum, the others die

without an ovum the sperm will die

♂

1

an ovum (egg cell) is released from the ovary = ovulation

♀

2

Ovum is fertilized by sperm cells and starts cell division.

OR

Ovum is not fertilized and dies in fallopian tube

♀

3

the fertiziled ovum starts cell division

♀

4

Implantation of the fertilized ovum, pregnancy has begun.

♀

fallopian tube

fertilization

ovulation

ovary

implantation

thick mucous lining

uterine wall

cervix

opening of uterus

Pregnancy

• embryo
• foetus
• placenta 

• umbilical cord 

Ultrasound scan and prenatal testing 

Ultrasound

Combined test

• 9th-14th week of pregnancy
• Blood test of mother and foetus
• ultrasound of neck fold measurement of foetus
• together these 2 tests determine whether a child has Down's syndrome

Nipt

• 11th week of pregnancy 
• non-invasive prenatal test
  
• Blood sample from the placenta
  
• DNA from placenta is nearly the same as the baby's
• shows likely hood of hereditary disease

Anomaly and non-medical scan

• after 20th week of pregnancy 
• Anomaly: check for abnormalities of the heart, brain, organs, and limbs
• Non-medical: 3D

• 10 weeks pregnant
• Sound waves used to make a picture of foetus in the womb
• used to see when the woman became pregnant and when the baby will be born.

What did we learn?

1.Describe the fertilization of the human egg

2.Decribe how pregnancy progresses

3. Explain prenatal testing and give examples

Do Now:

Read BS 6 - pregnancy

Do Qs. 1 t/m 3 and 5 (6-7 for VWO) and 8