2AGT 4.4 The Menstrual Cycle (practice)

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

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2TH 7.2 Voedselketens en kringlopen

§4.4

The menstrual cycle

2AGT

Lesson plan

• Look back to §4.4 (the menstrual cycle)
• Get to work + discuss

Lesson objectives

1. After todays lesson you can explain that hormones cause changes in the ovaries and uterus.

2. After todays lesson you know what happens in the uterus when the egg is not fertilized by a sperm cell.

The menstrual cycle

During 28* days:

- A** new egg cell develops in the
ovaries.

- The uterus lining will get thicker to
get ready for a fertilised egg cell.

Why is there a * or ** at: 'during
28* days' and 'A** new egg cell'?

Important dates

Pre-ovulation

Day 1-7: Menstruation

Day 1-14: New egg cell develops

Day 14: Ovulation

Post-ovulation

Day 15-28: Follicle turns into yellow body

- No fertilisation: Yellow body and egg cell dissolve, new menstruation.

- Fertilisation: Egg cell moves to uterus to implant.

A woman had her last menstruation on February 14th. When is her next ovulation?

1. February 15th
2. February 28th
3. March 7th
4. March 14th

A woman had her last menstruation on February 14th. When is her next menstruation?

1. February 15th
2. February 28th
3. March 7th
4. March 14th

Menstruation cycle summarized

Getting the egg and uterus ready.

             14 days

Ovulation

             14 days

Getting the uterus ready for implantation.

What's first? The menstruation or the ovulation?

1. Menstruation
2. Ovulation

What's first?

The egg cell first has to develop (day 1-14),
before the body can clean up after no
fertilisation has ocurred (day 14-28).

Sperm cells can live inside the female body up to 3 days. Which is the last day of the (regular) cycle where people have intercourse, without risking pregnancy?

1. Day 8
2. Day 9
3. Day 10
4. Day 11

Tip: When is a woman fertile?

Why is it not wise to only monitor the
fertile period to prevent pregnancy?

Tip: Is every woman fertile at the same time?

Hormones make menstruation happen

Pre-ovulation

- Oestrogen

- FSH

Post-ovulation

- LH

- Progesterone

What does every hormone do in order to make the menstrual cycle happen? Combine the right answers!

Oestrogen

Progesterone

FSH

LH

 Maintains lining of the womb - suppresses FSH production in the pituitary gland.

Triggers ovulation and progesterone production in ovaries.

Triggers the ripening of the egg cells and oestrogen production in the ovaries.

Stimulates the production of LH and suppresses the production of FSH in the pituitary gland.

Get to work

Go to Socrative -> Student Log in -> Class code EGGINK6305.

Work together in pairs of 2.

Keep your noise down, so whisper!

When the timer runs out, we'll discuss
the answers.

Checking homework

Forgot to make it?

• 1 red cross + name is added to spinner
• 3 red crosses? Detention
  

You did make it?

• 1 green cross
• 3 green crosses? Name is removed
  from spinner

Lesson objectives

1. Can you explain that hormones cause changes in the ovaries and uterus?

2. Do you know what happens in the uterus when the egg is not fertilized by a sperm cell?