Menstruation

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

The menstrual cycle

Menstrual Cycle

• What do you know?
• Important concepts
• Instruction
•  Work Time
• Feedback

What do you know?

Important concepts to know

• Menstrual Cycle
• Follicle
• Ovulation
• Oviduct
• Endometrium
• Menstrual Flow
• Menstruation
• Follicle Stimulating Hormone (FSH)
• Luteinising Hormone (LH)
• Oestrogen
• Progesteron
• Menopauze

Egg development and ovulation

• Menstrual cycle takes about 28 days
•  Set in motion by hormones
• Egg cells develop within follicles
• follicle grows by hormone stimulation
• follicle ruptures during ovulation
• Egg cell is released into the oviduct
• Through hormones, endometrium thickens
• If egg is unfertilized, the endometrium removes thickened lining, causing menstrual flow

How long does the average menstrual cycle last?

1. 20 days
2. 25 days
3. 28 days
4. 31 days

What is ovulation?

1. The development of the egg cell
2. the development of the follicle
3. the rupturing of the follicle

Phases of the menstrual cycle

Phase 1 -  menstrual flow (day 1-6)

• Start of the cycle
• Menstruation

Phase 2 - pre-ovulation (day 7-14)

• FSH is produced to stimulate the development of the follicle
• LH is produced to stimulate ovulation (day 14)

Phase 3 - post-ovulation (day 14-28)

• Oestrogen and Progesteron are produced to thicken the endometrium
• breaks down if unfertalized, repeating the cycle

Phase 1

Phase 2

Phase 3

Menstruation

4-6 days

FSH

LH

8 days

Oestrogen

Progesteron

15 days

Menopause

• Happens between ages 45 and 60
• Decrease of hormones
• End of ovulation 

Work time

What? make questions 14-19 on page 113-114 of your workbook.

Why? to test your understanding of the concept

How? Alone and in silence

Help? first read your textbook, then ask a neighbour, finally ask me

Time? 10-15 minutes

Done? Do something for yourself

Feedback

Each of you will get a post-it. On it, write: 

• what you thought about this class. 
• What I did good while giving this class. 
• What I could do better for the next time.