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Pressure Relationships in the Thoracic Cavity – Pulmonary Ventilation (Nursing)

by Jasmine Clark

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    00:01 So now let's move into the physiology of the respiratory system.

    00:06 The process of breathing is referred to as pulmonary ventilation.

    00:11 Pulmonary ventilation consists of two phases.

    00:15 The inspiration or inhaling where gas is going to flow into the lungs and then expiration or exhaling where gases are going to exit the lungs.

    00:27 Ventilation is going to depend on a relationship between different types of pressure inside and outside of the thoracic cavity.

    00:37 First we have our atmospheric pressure, which is the pressure outside of the thoracic cavity from the atmosphere.

    00:46 The next pressure is going to be our intrapulmonary pressure.

    00:50 This is the pressure that is inside of the lungs and is sometimes also referred to as the intra alveolar pressure.

    00:59 A third pressure is our intrapleural pressure.

    01:03 This is the pressure in that pleural cavity.

    01:05 Remember that thin space between the parietal and the visceral pleura.

    01:12 And finally we have our transpulmonary pressure, which is our intrapulmonary pressure minus our intrapleural pressure. (Ppul - Pip) All of these pressures are going to play an important role in our ability to undergo pulmonary ventilation.

    01:31 So recall that the atmospheric pressure is 760 as our diaphragm flattens during inhalation.

    01:41 The intrapulmonary pressure is going to drop to about 75.

    01:47 This happens when the lung expands and causes air to flow in.

    01:53 Another thing that happens is our intrapleural pressure is always negative compared to our atmospheric pressure.

    02:01 Because of this it creates a sort of vacuum that suctions the visceral pleura along with the thoracic cavity.

    02:10 So as the thoracic cavity expands the visceral pleura, which is attached to the lung, is going to expand with the thoracic cavity.

    02:20 The other pressure are transpulmonary pressure is positive and also sometimes referred to as the recoil pressure.

    02:29 This is also going to explain why the lungs are able to expand and recoil with the chest cavity.


    About the Lecture

    The lecture Pressure Relationships in the Thoracic Cavity – Pulmonary Ventilation (Nursing) by Jasmine Clark is from the course Respiratory System – Physiology (Nursing).


    Included Quiz Questions

    1. Inspiration and expiration
    2. Innervation and enervation
    3. Infusion and removal
    4. Dilation and constriction
    1. Intrapulmonary pressure
    2. Atmospheric pressure
    3. Intrapleural pressure
    4. Transpulmonary pressure
    1. Atmospheric pressure
    2. Intrapulmonary pressure
    3. Transpulmonary pressure
    4. Intrapleural pressure

    Author of lecture Pressure Relationships in the Thoracic Cavity – Pulmonary Ventilation (Nursing)

     Jasmine Clark

    Jasmine Clark


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