Pulmonary expansion: effects of the chest

2021-02-08 12:00 AM

The chest is resilient and flexible, similar to the lung, and even if the lungs are not present in the chest, the supporting muscles will still help the chest expand.

The chest is resilient and flexible, similar to the lung, and even if the lungs are not present in the chest, the supporting muscles will still help the chest expand.

Chest and lung adaptation together

The entire respiratory system (lungs and thoracic cavity) is measured while the lungs are dilated. To dilate the entire respiratory system, the pressure is twice as much as to dilate the lungs after removal of the chest cavity. Hence, the lung-thoracic combination is exactly equal to ½ of the single lung - 110 ml volume / 1 cmH20 for the combined system, compared with 220 ml / cmH2O for a single lung. In addition, when the lungs expand to large volume or compress to small volumes, the limit of the chest becomes extremely large. When near the limit, the pulmonary-thoracic dilation may be less than 1/15 of that of the solitary lung.

How to breathe in and out

Under normal gentle breathing, all respiratory muscle contraction takes place during inhalation and exhalation, which is mainly a passive process created by the elasticity of the lungs and chest. Therefore, under the relaxed state, the normal respiratory muscles do the "work" to create an inhalation but not an exhalation.

The way the respiratory system works can be divided into 3 parts:

(1) Pulmonary relaxation against the elastic force of the lung and thoracic-resilient resistance.

(2) Overcome the flexibility of lung structure and chest wall - tissue resistance.

(3) Overcome the resistance of the airways to remove air in the lungs - resistance to the airways.

Energy is needed for respiration

During normal breathing, only 3-5% of the body's total energy to dilate the lungs. however, during strenuous exercise, the amount of energy required increases by as much as 50-fold, however, the degree of increased airway resistance and pulmonary dilatation depends on the individual. Therefore, one of the main limits of how much exercise strength can be performed depends on the individual's ability to energize the muscles for single respiration.


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