Lung compliance is the ability of the lungs to expand. Elastance measures the work that has to be exerted by the muscles of inspiration to expand the lungs. Factors affecting these are discussed here.
Surface tension increases the tendency of the alveoli to collapse. Surfactant decreases the surface tension in the lungs and thus decrease the work of breathing, minimizes collapse and oedema.
A resistance to the inflow and out-flow of air is exerted by the walls of the airways. The impact of airway resistance, the flow dynamics and the factors governing the resistance are discussed here.
Air flow between the lungs and the environment occurs via a pressure gradient. This hub is on the changes in alveolar and pleural pressure changes in a breathing cycle and the resulting volume changes
Lung volumes and capacities tend to vary with age, sex, ethnicity and built. Alterations in the lung volumes are used to diagnose obstructive and restrictive lung diseases.
Breathing (inspiration and expiration) occurs in a cyclical manner due to the movements of the chest wall and the lungs. The resulting changes in pressure, causes changes in lung volumes.
Bulk flow of air in between the environment and the lungs is an important respiratory function. Coordinated, active movements of the thorax and the diaphragm, result in inspiration and expiration.
In addition to serving the function of respiration, the respiratory system is involved in providing immunity, in olfaction, in phonation, as a reservoir and a filter for CVS and as a metabolic ground
The respiratory physiology is on the process of incorporation of oxygen in the environment for the utilization of energy from the organic compounds and for the elimination of carbon dioxide