Summary
Inspiration and expiration are processes involved in the gas exchange system in humans.
- Inspiration — the process of taking air into the lungs. Example: During inspiration, the diaphragm contracts and moves downward.
- Expiration — the process of expelling air from the lungs. Example: During expiration, the diaphragm relaxes and moves upward.
- Diaphragm — a muscle that plays a crucial role in breathing. Example: The diaphragm contracts during inspiration to increase lung volume.
- Intercostal Muscles — muscles located between the ribs that assist in breathing. Example: Intercostal muscles contract to lift the ribcage during inspiration.
Exam Tips
Key Definitions to Remember
- Inspiration: the process of taking air into the lungs
- Expiration: the process of expelling air from the lungs
- Diaphragm: a muscle that plays a crucial role in breathing
- Intercostal Muscles: muscles located between the ribs that assist in breathing
Common Confusions
- Confusing the roles of the diaphragm and intercostal muscles
- Mixing up the processes of inspiration and expiration
Typical Exam Questions
- What happens to the diaphragm during inspiration? It contracts and moves downward.
- How do intercostal muscles assist in breathing? They contract to lift the ribcage during inspiration.
- What is the role of the diaphragm in expiration? It relaxes and moves upward.
What Examiners Usually Test
- The mechanics of breathing, including the roles of the diaphragm and intercostal muscles
- The differences between inspiration and expiration