Podcast
Questions and Answers
During inhalation, what happens to the pressure inside the lungs?
During inhalation, what happens to the pressure inside the lungs?
- It remains constant because the air pressure outside the lungs is equal to the air pressure inside the lungs.
- It increases due to the expansion of the chest cavity.
- It decreases due to the expansion of the chest cavity. (correct)
- It fluctuates depending on the rate of breathing.
What happens to the diaphragm during exhalation?
What happens to the diaphragm during exhalation?
- It relaxes, pushing upward and decreasing the volume of the chest cavity. (correct)
- It moves sideways, assisting the ribs in decreasing the chest cavity volume.
- It contracts, pulling downward and increasing the volume of the chest cavity.
- It remains flat, neither contracting nor relaxing.
What is the primary muscle responsible for inhalation?
What is the primary muscle responsible for inhalation?
- Internal intercostal muscles
- Abdominal muscles
- Diaphragm (correct)
- External intercostal muscles
Which of the following events occur during expiration?
Which of the following events occur during expiration?
Which of the following best describes the role of the external intercostal muscles during breathing?
Which of the following best describes the role of the external intercostal muscles during breathing?
Flashcards
What is Inhalation?
What is Inhalation?
The process of breathing in, where air enters the lungs.
What happens to the diaphragm during inhalation?
What happens to the diaphragm during inhalation?
During inhalation, the diaphragm contracts and moves down, increasing the space in the chest cavity.
What happens to the ribs during inhalation?
What happens to the ribs during inhalation?
During inhalation, the external intercostal muscles contract, pulling the ribs upward and outward.
What is Exhalation?
What is Exhalation?
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What happens to the diaphragm during exhalation?
What happens to the diaphragm during exhalation?
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Study Notes
Inhalation (Inspiration)
- External intercostal muscles contract
- Ribs move upward and outward
- Diaphragm moves downward
- Chest cavity volume increases
- Lung air pressure decreases
- Air flows into the lungs
Exhalation (Expiration)
- Muscles relax (primarily the external intercostals and diaphragm)
- Ribs move downward and inward
- Diaphragm moves upward
- Chest cavity volume decreases
- Lung air pressure increases
- Air is pushed out of the lungs
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Description
This quiz covers the mechanisms of inhalation and exhalation in the human respiratory system. Test your understanding of how muscles and pressure changes facilitate breathing. Perfect for biology students learning about respiratory physiology.
