3A 4.4 getting pregnant

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 3

Starter Assignment

Answer the following questions:

1. What is ovulation?

2. How many days does the menstrual cycle last?

2. Around which day of the cycle is the chance of conception greatest?

 

 

Welcome

Walk quietly into the room and speak softly

Sit on your chair

Take your book, notebook + pen

Starter Assignment

Answer the following question in your notebook:

1. What is ovulation?

2. How many days does the menstrual cycle last?

2. Around which day of the cycle is the chance of conception greatest?

 

 

Answers

1. Ovulation

2. 28 days

2. Day 14 (= ovulation)

Hoe kom je in de puberteit?

Programme

• Learning objectives
  
• Explanation of basic material 4 --> Getting pregnant
  
• Video of fertilization --> 8 minutes
  
• Making assignments
  
• Closing --> checking learning objectives

Theme 4 reproduction

• 4.1 Genitals
• 4.2 Puberty
  
• 4.3 Becoming fertile
  
• 4.4 Getting pregnant
  
• 4.5 Sexuality
  
• 4.6 Safe sex
  
• 4.7 More contraceptives
  
• 4.8 The birth

Learning objectives 4.4

• You can name the characteristics of sperm cells and egg cells
  
• You can describe how fertilization occurs in a human being
  
• You can describe how a pregnancy occurs
  
• You can explain what prenatal testing is and give examples of this

Getting pregnant

The egg cell must be fertilized by the sperm cell

Nucleus of the sperm cell must fuse with the nucleus of the egg cell

Fertile moment

• The egg is released in one of the fallopian tubes (ovulation)
  
• The sperm cells end up in the back of the vagina
  
• The sperm cells swim through the uterus towards both fallopian tubes
  
• One sperm cell can fertilize the egg (in the fallopian tube)

The fertilization

A nucleus of a sperm cell fuses with the nucleus of an egg cell,

this takes place in the fallopian tube.

Implantation: after about 6 days the ball of cells attaches itself to the thick uterine lining. Then the woman is pregnant

Pregnancy

0-8 weeks: Embryo

8 weeks to birth: Fetus

Nutrition:

- Uterine lining (embryo)

- Placenta (fetus)

-> via the umbilical cord

Placenta

The placenta grows at the place where the embryo is implanted. The placenta contains capillaries (very thin blood vessels where gas exchange can take place).

Amniotic fluid and amniotic membranes protect the unborn child.

Amniotic membranes

Amniotic fluid

Prenatal testing

• 8-12 weeks: Ultrasound: Determine how long the woman has been pregnant
  
• From 10 weeks: NIPT test (non-invasive prenatal test) --> blood test (child's DNA) for DNA abnormalities.
  
• 13 weeks --> ultrasound for examination of abnormalities in the heart, brain, organs and limbs
  
• 20 weeks --> ultrasound (check) and gender can be determined

Homework

Reading 4.4

Complete assignments 1 to 3 and 5 to 11

Klaar: puzzel laten maken

De menstruatie cyclus van de vrouw duurt +- 28 dagen, rondom welke dag is de kans op bevruchting het grootst?

Hoe heet een vrouwelijke geslachtscel? En hoe heet een mannelijke geslachtscel?