Biology B3 1.5 Ventilating the lungs.

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What is the breathing system designed to do?
Move air in and out of the lungs.
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What occurs due to changes of pressure inside the chest?
Ventilation.
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What do the lungs contain the exchange surface of?
The breathing system.
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Where are the lungs situated?
The lungs are situated in the thorax, inside the ribcage and above the diaphragm, which separates the lungs from the abdomen.
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What happens when we breathe in?
The intercostal muscles between the ribs and the diaphragm contact, the ribcage moves up and out and the diaphragm flattens, the volume of the thorax increases and the pressure in the thorax decreases and air is drawn in.
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What happens when we breathe out?
The intercostal muscles of the ribcage and diaphragm relax, the ribcage moves dow and in and the diaphragm becomes domed, the volume of the thorax decreases and the pressure increases and air is forced out.
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What is the movement of air in and out of the lungs known as?
Ventilation.
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** CHECK OUT DIAGRAMS***
**MAKE SURE YOU UNDERSTAND HOW BREATHING MOVEMENTS ALTER THE VOLUME AND PRESSURE INSIDE THE THORAX***
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Card 2

Front

What occurs due to changes of pressure inside the chest?

Back

Ventilation.

Card 3

Front

What do the lungs contain the exchange surface of?

Back

Preview of the front of card 3

Card 4

Front

Where are the lungs situated?

Back

Preview of the front of card 4

Card 5

Front

What happens when we breathe in?

Back

Preview of the front of card 5
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