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Describe the process of expiration?
- Expiration:
- 1. Intercoastal muscles and diaphragm relax - ribs and sternum move down and in, diaphragm becomes dome-shaped.
- 2. Volume of thoracic cavity decreases.
- 3. As a result air pressure on lung walls increases.
- 4. Therefore air is forced out of the lungs.
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What’s the first step of expiration?
Intercoastal muscles and diaphragm relax- ribs and sternum move down and in, diaphragm becomes dome-shaped.
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What relaxes allowing the ribs and sternum to move down and in, at expiration?
Intercoastal muscles and diaphragm relax- ribs and sternum move down and in, diaphragm becomes dome-shaped.
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At expiration, how does the diaphragm become shaped?
Intercoastal muscles and diaphragm relax- ribs and sternum move down and in , diaphragm becomes dome-shaped.
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What does the intercoastal muscles and diaphragm relaxed lead to?
- Intercoastal muscles and diaphragm relax- ribs and sternum move down and in, diaphragm becomes dome-shaped.
- The volume of thoracic cavity decreases.
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What happens the volume of the thoracic cavity at expiration?
The volume of thoracic cavity decreases at expiration.
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What happens as a result of the volume of thoracic cavity decreasing at expiration?
At expiration the volume of thoracic cavity decreases and as a result, air pressure on the lung walls increases.
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How is air forced out of the lungs at expiration?
- Volume of thoracic cavity decreases
- Air pressure on lung walls increases
- Therefore air is forced out of the lungs.
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Is inspiration passive/ active?
Inspiration is active (requires energy, muscles contract).
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Why is inspiration active?
Requires energy, muscles contract.
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Is expiration active/passive?
Expiration is passive.
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