Lung Expansion
Lung Expansion - Related Videos
09:42
Analysis of Thermal Expansion via Dilatometry
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2023
Source: J. Jacob Chavez, Ryan T. Davis, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Thermal expansion is extremely important when considering which materials will be used in systems that experience fluctuations in temperature. A high or low thermal expansion in a material may or may not be desirable, depending on the application. For instance, in a common liquid thermometer, a material with a high thermal expansion would be...
07:06
A Simple Method of Mouse Lung Intubation
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Cited by 50 •
2013
This paper describes a striaghforward and efficient method of intubating mice for pulmonary function measurements or pulmonary instillation, that allows the mice to recover and be studied at later times. The procedure involves an inexpensive fiberoptic light source that directly illuminates the trachea.
01:47
Lung Capacity
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2019
The air in the lungs is measured in volumes and capacities. Lung volume measures reflect the amount of air taken in, released, or left over after a lung function, like a single inhalation. Lung capacity measures are sums of two or more lung volume measures. There are four defined lung volume measures: tidal volume, inspiratory reserve volume, expiratory reserve volume, and residual volume. Tidal volume is the amount of air inhaled and exhaled in a normal breath. Inspiratory...
05:35
Lung Instillation and Fixation: Introducing Liquid into the Trachea and Fixing Lungs to Measure the Fixed Lung Volume
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2023
This video describes a simple and reliable method of introducing liquid into the trachea for lung instillation, fixation, and lung volume measurement.
01:24
Heat and Free Expansion
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2023
The work done by a thermodynamic system depends not only on the initial and final states but also on the intermediate states—that is, on the path. Like work, when heat is added to a thermodynamic system, it undergoes a change of state, and the state attained depends on the path from the initial state to the final state. Consider an ideal gas cylinder fitted with a piston. When the cylinder is heated at a constant temperature, the gas molecules absorb energy and expand slowly in a controlled...
FAQs
During inspiration, diaphragm contraction enlarges the thoracic cavity, lowering pressure within the lungs relative to the atmosphere. This pressure difference drives air through the airways and into the alveoli. The resulting increase in ventilated lung volume is clinically important because it supports gas exchange, while failure to generate the gradient can contribute to reduced ventilation.
Elastic recoil provides the passive force that helps return the lungs toward a smaller volume during exhalation after inspiratory muscles relax. Lung expansion therefore depends on a coordinated cycle rather than inhalation alone. In clinical assessment, observing whether breathing produces adequate expansion and subsequent emptying helps identify impaired ventilation and follow changes over time.
Reduced lung expansion can contribute to atelectasis, a clinical concern associated with inadequate ventilation. This relationship matters because interventions are selected to promote fuller breathing and support ventilation. Deep-breathing exercises, incentive spirometry, positioning, and mechanical ventilation represent different clinical approaches for supporting expansion when normal breathing is impaired.
Physical examination provides a noninstrumental way to assess lung expansion and respiratory function. Clinicians can use it alongside ongoing observation of breathing and responses to expansion-promoting measures to monitor whether ventilation is improving. This assessment is especially relevant after surgery or when another condition interferes with normal breathing, because both situations may require additional respiratory support.
Deep-breathing exercises and incentive spirometry are used to promote lung expansion rather than simply observe it. In clinical care, these approaches are particularly relevant during recovery after surgery or when normal breathing is impaired. Their purpose is to support ventilation and help prevent or treat atelectasis, making them active components of respiratory management.
Positioning and mechanical ventilation are clinical methods used when normal breathing does not provide sufficient lung expansion. They are relevant in situations involving reduced ventilation or impaired breathing and can be incorporated with physical examination and other respiratory measures. Ongoing monitoring of respiratory function helps clinicians evaluate the need for, and response to, this support.