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How does the diaphragm contribute to breathing?

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Question: How does the diaphragm contribute to breathing?

Options:

  1. By filtering air
  2. By contracting and relaxing to change lung volume
  3. By producing sound
  4. By transporting oxygen

Correct Answer: By contracting and relaxing to change lung volume

Solution: 

The diaphragm contracts and relaxes to change the volume of the thoracic cavity, facilitating inhalation and exhalation.

How does the diaphragm contribute to breathing?

Practice Questions

Q1
How does the diaphragm contribute to breathing?
  1. By filtering air
  2. By contracting and relaxing to change lung volume
  3. By producing sound
  4. By transporting oxygen

Questions & Step-by-Step Solutions

How does the diaphragm contribute to breathing?
  • Step 1: The diaphragm is a dome-shaped muscle located at the bottom of the chest cavity.
  • Step 2: When you inhale, the diaphragm contracts and moves downwards.
  • Step 3: This contraction increases the volume of the thoracic cavity (the chest area).
  • Step 4: As the volume increases, air is drawn into the lungs through the nose and mouth.
  • Step 5: When you exhale, the diaphragm relaxes and moves back up to its original position.
  • Step 6: This relaxation decreases the volume of the thoracic cavity, pushing air out of the lungs.
  • Diaphragm Function – The diaphragm's role in changing thoracic cavity volume to enable breathing.
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