Asked by Beein Koriyan on May 08, 2024
Verified
During inspiration, contraction of the diaphragm causes the volume of Mr. Jones' thoracic cavity to increase and the pleural pressure to decrease. The pressure in his alveoli (Palv) will
A) decrease below atmospheric pressure (PB) , causing air to move out of his lungs.
B) become greater than atmospheric pressure (PB) , causing air to move into his lungs.
C) decrease below atmospheric pressure (PB) , causing air to move into his lungs.
D) become greater than atmospheric pressure (PB) , causing air to move out of his lungs.
E) does not change.
Thoracic Cavity
Space within the thoracic walls, bounded below by the diaphragm and above by the neck.
Pleural Pressure
The pressure within the pleural cavity, which can become negative relative to atmospheric pressure during inhalation, aiding lung expansion.
Atmospheric Pressure
The pressure exerted by the weight of the atmosphere, which at sea level is approximately 101.3 kilopascals (760 mmHg).
- Comprehend the essential physiological mechanisms that regulate both breathing and gas exchange at the alveolar level.
Verified Answer
ZK
Zybrea KnightMay 10, 2024
Final Answer :
C
Explanation :
During inspiration, the diaphragm contracts, increasing the volume of the thoracic cavity and decreasing the pressure in the alveoli below atmospheric pressure, which causes air to move into the lungs.
Learning Objectives
- Comprehend the essential physiological mechanisms that regulate both breathing and gas exchange at the alveolar level.