For each description of respiratory pressures A–E, select the most appropriate option from the following list.
1. Intrapleural pressure.
2. Intra-abdominal pressure.
3. Intra-alveolar pressure.
4. Intra-oesophageal pressure.
5. Atmospheric pressure.
A. Intra-alveolar pressure at end-inspiration and end-expiration.
B. Shows transient rises and falls during the respiratory cycle peaking at mid-expiration and mid-inspiration respectively.
C. Approximates to intrapleural pressure.
D. Rises markedly during the vomiting reflex.
E. Determines the pressure gradient for inspiration and expiration.