4.4 becoming pregnant

• Biologie
• Middelbare school
• havo
• Leerjaar 2

Start task

1. Copy the following learning objectives into your zuidschrift:

• You can name the characteristics of sperm cells and egg cells.
• You can describe the fertilization of a human egg cell.
• You can describe how a pregnancy progresses.

2. Join this LessonUp. Close all other tabs.

Agenda

• Discuss homework: menstrual cycle
• Theory: becoming pregnant 
• Assignments
• Lesson end 

asg. 6

Figure 8 shows a timeline covering 75 days. A woman has her period in the first four days. Thirty days after the first day of that menstruation, her next period starts. She menstruates regularly and her menstruations always last for four days.

Asg 6a. Lisa has ovulated regularly (every four weeks) from her 13th birthday onwards. Her menopause starts on about her 46th birthday and stops when she turns 51. Lisa has never been pregnant.

Roughly how many ovulations will there have been in her body between her 13th and 46th birthdays? Include a calculation in your answer.

asg. 7

Figure 8 shows a timeline covering 75 days. A woman has her period in the first four days. Thirty days after the first day of that menstruation, her next period starts. She menstruates regularly and her menstruations always last for four days.

asg. 7

Figure 8 shows a timeline covering 75 days. A woman has her period in the first four days. Thirty days after the first day of that menstruation, her next period starts. She menstruates regularly and her menstruations always last for four days.

asg. 7

Figure 8 shows a timeline covering 75 days. A woman has her period in the first four days. Thirty days after the first day of that menstruation, her next period starts. She menstruates regularly and her menstruations always last for four days.

asg. 7

Figure 8 shows a timeline covering 75 days. A woman has her period in the first four days. Thirty days after the first day of that menstruation, her next period starts. She menstruates regularly and her menstruations always last for four days.

asg. 7

Draw asterisks to mark the days on which this woman probably ovulates.

asg. 7

Draw asterisks to mark the days on which this woman probably ovulates.

asg. 7

Draw asterisks to mark the days on which this woman probably ovulates.

What will we learn about?

erectile tissue

 sperm cells and egg cells

fertilization

implantation

pregnancy

asg. 7

Draw asterisks to mark the days on which this woman probably ovulates.

Erectile tissue and an erection

Erectile tissue can fill with blood and expand (erection).

The structure of erectile tissue is similar.

Clitoral erection is less visible.

sperm vs egg

Sperm cells can survive for up to 5 days.

For fertilisation to occur, an egg cell must also be present in the fallopian tube.

An egg cell lives for approximately 12 to 24 hours after ovulation.

fertile days

bevruchting

Fertilisation

Divisions of the egg cell after fertilisation and implantation (5 to 7 days later) in the uterus

Ovulation

fertilisation

first divisions

implantation

Placenta and umbilical cord

The embryo is connected to the placenta through the umbilical cord.

After 8 weeks → fetus

In the placenta:

• The mother’s blood flows very close 

to the embryo’s blood.

• Oxygen and nutrients pass from the 

mother to the embryo.

• Waste products from the embryo pass 

to the mother.

Protection

Amniotic membranes and amniotic fluid:

The amniotic membranes surround the fetus.

Inside the amniotic membranes is the amniotic fluid.

Pregnancy

About 38 weeks after fertilisation, a baby is born.

klik

These transport egg cells.

1. vagina
2. sperm ducts
3. ovaries
4. fallopian tubes

In this, a fertilised egg can develop into a baby.

1. vagina
2. sperm ducts
3. ovaries
4. fallopian tubes

This is where the development of egg cells takes place.

1. vagina
2. uterus
3. ovaries
4. fallopian tubes

How often does ovulation occur in a fertile woman?

1. every 12 to 24 hours
2. approximately once every two weeks
3. approximately once every four weeks

An egg cell that is not fertilised dies.
What happens to the remains of the egg cell?

1. The remains leave the body along with the lining and blood during menstruation.
2. The remains are absorbed into the blood in the uterus.
3. The remains are absorbed into the blood in the fallopian tube.

What happens on day 14 of the menstrual cycle?

1. menstruation
2. ovulation
3. implantation
4. pregnancy

Periodieke onthouding - Onbetrouwbaar- Ovulatie

What is the shedding of part of the uterine lining called?

1. fertilisation
2. implantation
3. menstruation
4. ovulation

menstruatiecyclus:
wat gebeurt er tijdens dag
1 t/m 5

1. ovulatie
2. innesteling
3. menstruatie
4. bevalling

Which of these parts leave a woman's body during menstruation?

1. the top layer of the uterine lining
2. an unfertilised egg cell
3. only blood
4. blood + unfertilised egg cell

Tijdens de menstruatiecyclus verandert de slijmlaag aan de binnenkant van de baarmoeder.

Hier zie je drie keer de doorsnede van een baarmoeder afgebeeld.

Bij welk moment van de menstruatiecyclus hoort de doorsnede?

during menstruation

short after menstruation

during ovulation

new egg cell matures

ovulation

egg cell dies

new egg cell matures

Menstruation

Uterine lining thickens

Menstruation