3.5 Taking out the rubbish

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

Paragraph 3.5: Taking out the 'rubbish'

Lesson objectives

• You can name all excretory organs, and explain what their functions are
• You can explain which waste materials are disposed of in each of the excretory organs
• You can explain how the kidney filters blood and produces urine

We will revisit these lesson goals later on!

What is the definition of excretion?

excretory organs

what is the way of urine?

a kidney

- blood enters via Renal Artery

- Flows to the Cortex

- is cleaned in Nephrons in the 

   Medulla

- blood flows through the Renal vein 

- urine flows to the Renal pelvis

- into the ureter

(- to the bladder)

The Bowman’s capsule (renal capsule):

surrounds a ball of capillaries called the capillary knot

high pressure is created in the capillary knot by the diameter of the capillary leaving the knot being narrower than the capillary entering

this pressure results in ultrafiltration where water, salts, glucose, and other small molecules pass out of the capillary and into the Bowman's capsule

proteins and blood cells are too big to leave the capillaries to go into the tubule

The rest of the tubule is responsible for the selective reabsorption of glucose, some salts, and lots of the water.

The collecting duct is responsible for the selective reabsorption of water and for sending urine to the ureter.

Discussion

Discuss with your neighbor whether you would donate one of your kidneys to one of your parents?

Or a friend?

Or a total stranger?

Lesson objectives

• You can name all excretory organs, and explain what their functions are
• You can explain which waste materials are disposed of in each of the excretory organs
• You can explain how the kidney filters blood and produces urine

We will revisit these lesson goals later on!

Work to be done

3.5: Exercises 70-74 and Concept list

Glossary puzzle (p. 99 – 100)

Which of the follwoing substances is not a waste product?

1. Toxins
2. Glucose
3. excess water and salt
4. Carbon dioxide

Which of the following organs is not an excretory organ?

1. Large intestine
2. Kidney
3. Small intestine
4. Skin

Large intestine

Skin

Lungs

Kidneys

Carbon Dioxide

Other waste from blood

Undigested food

Salt

Water

Water

Water

Water

Salt

The kidney recieves blood from

Tis renal artery is...

1. high in oxygen and high in waste products
2. high in oxygen and low in waste products
3. low in oxygen and high in waste prodcuts
4. low in oxygen and low in waste products

The main function of the kidney is

1. To remove carbon dioxide from the blood
2. to remove waste products from the blood
3. To add carbondioxide to the blood
4. To add nutrients to the blood

Back to the lesson goals..

As mentioned earlier, we would be coming back to the lesson goals.

The following slides will show a question related to the lesson goals, which you can answer. Through this, we will test whether you have 'completed' this lesson and are able to move on.

Name the four excretory organs that are discussed in the book.

What is the excretory organ mentioned in the video, but not in the book?

1. Skin
2. Lungs
3. Liver
4. Pancreas

Again, link the waste product to the organ!

Large intestine

Skin

Lungs

Kidneys

Carbon Dioxide

Other waste from blood

Undigested food

Salt

Water

Water

Water

Water

Salt

And.. done!

• You have finished this lesson. 
• Start now with the excersises from your workbook