1.4 Breathing

• Biologie
• Middelbare school
• vwo
• Leerjaar 3

U1: combustion and respiration

Planning for today

• Planning till test (2 min)
• Lookback last class (10 min)
• 1.4: Breathing (10 min)
• Exercises (20 min)

at the end of class

... you can describe how inhalation and exhalation are achieved.

 

planning till test

29/09	1.4 breathing
30/09	1.8 cold and warmblooded
06/10	Prepare for test
07/10	Test

Complete sentences. Choose between: a lot of – only a little.

• The air at arrow 1 contains ...  oxygen and ...  carbon dioxide.
  
• The air at arrow 2 contains ...  oxygen and ... carbon dioxide.
  
• The blood at arrow 3 contains ,,,  oxygen and ...  carbon dioxide.
  
• The blood at arrow 4 contains  ... oxygen and  ...carbon dioxide.
  

Explain how you can tell from the diagram which interval (P or Q) had more combustion taking place in Alex’s body.

You breathe using the respiratory muscles.

chest breathing

In chest breathing (thoracic breathing), the ribs and the breastbone move.

Breath in:

Intercostal muscles tense --> moves your ribs and breastbone up,

Breath out:

Intercostal muscles relax --> moves your ribs and breastbone down.

abdominal breathing

In abdominal breathing (diaphragmatic breathing), the diaphragm and abdominal wall move.

Breath in:

The diaphragm contracts, making it move downwards

Breath out:

The diaphragm relaxes, making it move back upwards to normal position.

Homework

Read 1.4: chest and abdominal breathing

make ex. 2,3,8,9

done? 

Make test yourself 1.4