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objectives
objectives
Breathing
Breathing
The breathing system is used by the body to get the oxygen needed for respiration.
It is also use to get rid of the waste product of respiration, the gas carbon dioxide.
Breathing in and breathing out are separate processes in the body:
Breathing in is also known as inhalation. When you inhale you breathe in air, including oxygen, into your lungs.
Breathing out is also known as exhalation. When you exhale you breathe out the contents of our lungs and getting rid of the waste gas carbon dioxide.
breathing - summary video
breathing - summary video
breathing activity
breathing activity
Copy and Complete the table below using the words in brackets in the what happens column
How we Breathe
How we Breathe
Air enters through either the mouth or the nostrils.
It does not matter through which opening the air enters because the oral and nasal cavities are connected.
The pharynx
The pharynx
- As the air passes through the nasal cavity, the air is smelt, warmed, filtered and moistened slightly.
- The air meets at the pharynx, a junction at back of the oral cavity.
- The pharynx is a junction between two tubes. The air must travel down only one of these tubes. One is the windpipe (trachea) and the other is the gullet (oesophagus).
Alveoli at Work
Alveoli at Work
Alveoli are the air sacs that appear inside the lungs. They fill with oxygenated air when we breathe in and allow gas exchange to happen with oxygen, carbon dioxide and our blood. They are specially adapted for this process.
alveoli activity
alveoli activity
Write out the sentences and choose the correct word out of each choice.
• The alveoli have....
•A small/large surface area.
•A moist/dry surface to allow oxygen to dissolve.
•A thin/thick lining to allow easy diffusion of gases.
•A few/lot of blood capillaries surrounding them for easy gas exchange.
laws of diffusion
laws of diffusion
demonstrating your knowledge activity
demonstrating your knowledge activity
•Orlando Oxygen is updating his blog
•In 2 paragraphs describe his journey from the atmosphere into the bloodstream.
Key words you MUST include:
- Diffusion
- Gradient
- Large surface area
- One cell thick
- Moist
- Trachea
- Pharynx
- Bronchus
- Bronchioles
- Alveoli
- Blood plasma
- Gas exchange
- capillaries
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