Alveoli

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

Welcome!

Today's lesson:

Parts of the respiratory system

Explanation about alveoli (page 27)

Working on homework exercises 

Name 2 reasons why it's better to breathe through your nose.

What is the name of part number 3?

What is the name of part number 11?

What is the name of part number 15?

What is the name of part number 2?

What is the name of part number 16?

What are we going to learn today?

Today we will learn:

Where the exchange of CO2 and oxygen take place. 

How this exhange happens. 

In which ways we can breath. 

Alveoli

Around your alveoli are tiny blood vessels, which are only one cell thick. These are called capillaries. Blood that goes to your alveoli don't have much oxygen but have a lot of CO2. When it passes the alveoli it will give CO2 to the alveoli and takes oxygen. 

This process is called gas exchange. 

Differences in air that you breathe in and out

Chest breathing

We breathe using two methods. The first one is called chest breathing. While doing that, we contract our intercostal muscles, squeezing the air out of our lungs. When they relax, we breathe in again due to a difference in air pressure in and out of our lungs. 

Abdominal breathing

Sometimes you also see your belly move when you breathe, this is due to abdominal breathing. Your diaphragm moves up and down. Squeezing out your lungs and creating positive and negative air pressure within your lungs. 

You see your belly move because the diaphragm moves your organs while doing this. 

Homework next lesson

You need to have the exercises of paragraph 1.4 finished for the next lesson. You need to do exercise 1 through 9, but you can skip 4.