Intrapulmonary pressure is the pressure within the air passage and the alveoli of the lungs.
Pressure increases as volume increases, granted the container stays the same.
Shunting of a circuit is the electrical terminology for bypassing a circuit.
Inspiration occurs when the intrapulmonary pressure decreases to below atmospheric pressure
inspirtation
When the atmospheric pressure is higher than intrapulmonary pressure pressure, inspiration will not take place.
Intrapulmonary pressure
Transpulmonary pressure
Decrease
Intrapulmonary pressure will equalize to atmospheric pressure during a breathing cycle, but intrapleural pressure should always be less than atmospheric pressure.
This occurs within the respiratory system. During inpiration, the intercostal muscles contract, the diaphragm descends, and the rib cage rises. The thoracic cavity volume increases, stretching the lungs, and the intrapulmonary volume increases. This causes the intrapulmonary pressure to drop. Air flows into the lungs until the intrapulmonary pressure equals the atmospheric pressure. During expiration the intercostal muscles relax, the diaphragm rises, and the rib cage descends. The thoracic cavity volume decreases, causing the the lungs to recoil, and the intrapulmonary volume decreases. This causes the intrapulmonary pressure to rise, and the air flows out of the lungs until the intrapulmonary pressure equals the atmospheric pressure.
expiration