Question

1. Describe the relationship between pressure, volume, resistance and flow. How is this similar to blood flow through the heart and vessels? 2. What is intrapulmonary pressure? If it is higher than atmospheric pressure, what happens? What happens if it is lower than atmospheric pressure? Which gas law would you apply to explain this? State the law. 3. What is intrapleural pressure? Why is it important? 4. What would happen if intrapleural pressure became higher than intrapulmonary pressure? What might cause this? 5. Explain the events of inspiration and expiration in terms of muscle contraction, change in volume (space), change in pressure, and flow.

Answer 1

2.INTERPULMONARY PRESSURE also known as ALVEOLAR PRESSURE .it is the pressure inside the LUNGS

as alveoli are connected to atomosphere via tubing to airways so interpulmonary pressure is always equal to atmospheric pressure.

if ATMOSPHERIC PRESSURE IS MORE THAN ALVEOLAR PRESSURE THEN:generally alveolar pressure is measured equal to atmospheric pressure which is ought to be zero.

if it is greater than atmosphric oressure it is considered as positive and air flows out ..princible of expiration follows same criteria

if it is LOWER than atmospheric pressure:it is considered as negative and inspiration takes place with this mechanism.

we can take partial pressure of co2 and partial pressure of o2 with alveolar pressure to spply this.