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Which of the following processes occurs during expiration? (2023)
Practice Questions
Q1
Which of the following processes occurs during expiration? (2023)
Diaphragm contracts
Intercostal muscles relax
Lungs expand
Air is drawn in
Questions & Step-by-Step Solutions
Which of the following processes occurs during expiration? (2023)
Steps
Concepts
Step 1: The diaphragm, a muscle at the bottom of the chest, relaxes.
Step 2: The intercostal muscles, which are between the ribs, also relax.
Step 3: When these muscles relax, the space in the chest (thoracic volume) gets smaller.
Step 4: As the thoracic volume decreases, air is pushed out of the lungs.
Step 5: This process of pushing air out is called expiration.
No concepts available.
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