1.3 Like a pair of bellows

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

Why is it more healthy to breathe through your nose?

Put the organs in the correct order

Air enters the body

Gas exchange

Nasal cavity

Alveoli

Pharynx

Larynx

Bronchi

Bronchioles

Trachea

Which of the following processes do not take place in the alveoli?

1. Filtering the air
2. Gas exchange
3. Respiration
4. Diffusion

Finish the sentence:
'Gas exchange ...'

The process where food is burnt to get usable energy is called ...

+

+

->

Put the molecules/ words in the correct order for the process called respiration. 

This process takes place in the ...

Glucose

CO₂

O₂

H₂O

mitochondria

chloroplasts

Which process is shown in the picture?

1. Diffusion
2. Osmosis
3. Gas exchange
4. Respiration

Which process is shown in the picture?

1. Diffusion
2. Osmosis
3. Gas exchange
4. Respiration

Which process is shown in the picture?

1. Diffusion
2. Osmosis
3. Gas exchange
4. Respiration

Drag the boxes on the right to the correct place in the picture.

Alveolus

Oxygen

Red blood cell

Blood with little oxygen

Blood with lots of oxygen

Air

CO2

EXPLANATION.

BREATHING & LUNG VOLUME

Thoracic inhalation:

1. intercostal muscles contract
2. ribs move up
3. ribs pull the pleural membrane open
4. pleural membrane pulls open the lungs
5. air is sucked into the lungs

Thoracic exhalation:

1. intercostal muscles relax
2. ribs move down
3. ribs push the pleural membrane closed
4. pleural membrane pushes closed the lungs
5. air is pushed out of the lungs

Abdominal inhalation:

1. abdominal muscles contract
2. the diaphragm moves down
3. the diaphragm pulls the pleural membrane open
4. pleural membrane pulls open the lungs
5. air is sucked into the lungs

Abdominal exhalation:

1. abdominal muscles relax
2. the diaphragm moves up
3. the diaphragm pushes the pleural membrane closed
4. pleural membrane pushes closed the lungs
5. air is pushed out of the lungs

THORACIC INHALATION

THORACIC EXHALATION

ABDOMINAL INHALATION

ABDOMINAL EXHALATION

intercostal muscles contract

intercostal muscles relax

diaphragm relaxes

diaphragm contracts

ribs push the pleural membrane closed

the diaphragm moves up

the diaphragm pulls the pleural membrane open

EXPLANATION.

BREATHING & LUNG VOLUME

TASK. Copy to your notebook & finish the text. 

When you inhale the diaphragm muscle
contracts / relaxes . This pulls the diaphragm upwards / downwards . The intercostals relax / contract and pull the ribcage upwards / downwards . This increases / decreases the volume inside your rib cage. The air now rushes into / out of the lungs. This happens because the air pressure in the lungs is lower / higher than the air pressure outside the body.

DONE ? Study 1.3 Like a pair of bellows

Exercise 25

Work on exercise 25 on p.20 wb 

Spirometer

Homework

study p18-20 (not red part) do 20,21,23,24