3.4 Excretion

• Biologie
• Middelbare school
• vmbo t, mavo, havo
• Leerjaar 2

Start task

1. Copy the learning goals below into your zuidschrift.

2. Look it up: what are the differences between arteries, veins and capillaries again? Write down.

Learning goals, you can:

- name the parts of the kidneys and the urinary system.

- explain what each part does (function).

plan 

1. Starter activity circulation - 10 min
2. Planning for the coming weeks - 5 min
3. Explanation: Kidneys and urinary system - 20 min
4. Assignments - 10 min + ~15 min at home

Learning goals, you can:

- name the parts of the kidneys and the urinary system.

- explain what each part does (function).

vein

capillary

artery

capillary

artery

vein

In which direction does the blood flow?

to

away from

vein

artery

What is the flow direction of the systemic circulation?

1.

2

3.

4.

5.

Left ventricle

Aorta

Rest of the body

Veins

Right atrium

Write in your zuidschrift (p.5)

Friday 11 April:

Test 3.4 excretion + 3.5 immune system

Introduction

Blood that flows away from the organs contains a lot of 

carbon dioxide and other waste substances.

These substances are removed from the body.

Biologists call this process excretion.

géén aantekening!

3.4 Excretion

Excretion happens in different organs.

Carbon dioxide, for example, is excreted by the lungs.

Most other waste substances are excreted by the kidneys.

They remove the waste from the blood and turn it into urine.

You pee out the urine, which makes the waste leave your body.

géén aantekening!

💧 Function of the kidneys

- Remove waste substances from the blood

- Control the amount of fluid in your body

🩸 Blood vessels near the kidneys

Renal artery: oxygen-rich blood with waste substances → to the kidney

Renal vein: cleaned blood 

→back to the body

🏗️Parts of the kidney

Renal cortex & renal medulla: filter the blood

Renal pelvis: collects the urine

renal

pelvis

ureter

renal cortex

renal medulla

🛤️ Urinary tract: order

2 Ureters → carry urine to the bladder

Bladder → temporarily stores the urine

1 Urethra → carries urine out of the body

"ureter to the bladder"

"urethra: pee away"

💡 Note

Urine = waste substances + water

The more you drink, the lighter the urine

questions ??

1

5

2

3

4

6

bladder

ureter

kidney

renal artery

renal vein

urethra

What	Do assignments 1 to 8 blz 207-210
How
Help	.
Done?	Learn key terms of bs 3.4 Test yourself + flash cards in Bvj online.

1. book: text and pictures from pages 206–207
2. neighbour
3. teacher

You may quietly work together with your neighbour .

Conversations should only be about the assignments.

Learning goals: After this lesson you can:

- name the parts of the kidneys and the urinary system.

- explain what each part does (function).

Fill in

1. produce urine

2. collect urine

3. carry the urine to the bladder

renal cortex + renal medulla

renal pelvises

ureters

What do the kidneys do?

1. Remove waste substances from the blood
2. Add oxygen to the blood
3. Add nutrients to the blood
4. Remove carbon dioxide

What have you learned?