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Which of the following processes occurs during expiration? (2023)

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Question: Which of the following processes occurs during expiration? (2023)

Options:

  1. Diaphragm contracts
  2. Intercostal muscles relax
  3. Lungs expand
  4. Air is drawn in

Correct Answer: Intercostal muscles relax

Exam Year: 2023

Solution: 

During expiration, the diaphragm relaxes and the intercostal muscles also relax, leading to a decrease in thoracic volume and expulsion of air from the lungs.

Which of the following processes occurs during expiration? (2023)

Practice Questions

Q1
Which of the following processes occurs during expiration? (2023)
  1. Diaphragm contracts
  2. Intercostal muscles relax
  3. Lungs expand
  4. Air is drawn in

Questions & Step-by-Step Solutions

Which of the following processes occurs during expiration? (2023)
  • 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.
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