3.4 excretion

• Biologie
• Middelbare school
• vwo
• Leerjaar 2

schedule 

• Welcome       
• 3.4 excretion                                10 min.
• Video                                                5 min.                                            
• Talking point                                 2 min.
• Making assignments                10 min. 
• Test  discussion                          20 min
• Closing                                              3 min. 

Learning goal 3.4

At the end of the lesson...

• You can name the parts of the kidneys and urinary tracts with their features and functions.

3.4 Excretion

* Waste needs to be removed otherwise it piles up

* Excretory organs remove waste by excretion

excretory organs

Important differende between ureters and the urethra 

Write this down!

0

Talking point 

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

1. One of your parents?

2. A friend?

3. A total stranger?

what is the way of urine?

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.

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)

Assignments 3.4 

make assignment 1 until 8 skip 4. 

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.

Which of the follwoing substances is not a waste product?

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

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

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

And.. done!

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