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Relaxation of the diaphragm and intracostal muscles causes the pressure inside the thorax to be higher than that outside the body. the contraction and relaxation of these things change the volume of lungs and thus the air pressure in the lungs. Air moves from high pressure to low pressure, so during inspiration, the external intercostal muscles contract (the internal intercostals relax) which brings the rib cage upwards and outwards, the diagphram contracts and goes downwards which all increases the size of the thoracic cavity (and due to the plueral membrane) and thus that of the lungs. This creates an area of lower pressure in the lungs and therefore air is cause to flow in. The opposite occurs in expiration. the intercostal muscles work to pull the ribcage inwards and diaphragm bulges upwards making the lungs smaller. this then creates an area of high pressure in the lungs and air is drawn out " what way does it goes? high to low. "
What else can I help you with?
When does the lung relax?
The lung doesn't relax, it is controlled by the diaphragm When it relaxes the volume of the lungs decrease during expiration When it contracts the volume of the lungs increases during inhilation
What are the causes of a prolonged expiration phase?
Causes of a prolonged expiration phase can include airway obstruction, such as in conditions like asthma, chronic obstructive pulmonary disease (COPD), or bronchiolitis. Other potential causes may include bronchospasm, mucus accumulation in the airways, or lung diseases like interstitial lung disease. It is important to consult a healthcare provider for proper evaluation and management.
Under what internal condition does air tend to flow out of the lungs?
Air tends to flow out of the lungs when the internal pressure of the lungs is higher than the atmospheric pressure. This pressure difference is created by the contraction of the diaphragm and intercostal muscles during exhalation, which reduces the volume of the lungs and forces air out.
What does tar causes?
Tar Causes Lung Cancer.
What another name for peak flow meter?
Another name for a peak flow meter is a peak expiratory flow meter (PEFM). This device is used to measure the maximum speed of expiration, helping to monitor lung function, especially in individuals with asthma or other respiratory conditions.
What happens to the Alveolar attachments in COPD?
•The normal airway is distended by alveolar attachments during expiration, allowing alveolar emptying and lung deflation. In COPD, these attachments are disrupted because of emphysema, thus contributing to airway closure during expiration, trapping gas in the alveoli and resulting in hyperinflation
Does the duration of inspiration or expiration vary during ERV or FVC?
Yes, the duration of inspiration or expiration can vary during forced vital capacity (FVC) and expiratory reserve volume (ERV) maneuvers. This variation is influenced by individual factors such as lung capacity, respiratory muscle strength, and airway resistance. In general, inspiration tends to take longer during FVC, while expiration tends to take longer during ERV.
What are the strengths of the bell jar model of the lungs?
The bell jar model of the lungs is a simple representation that helps illustrate how changes in pressure impact lung volume and air flow. It is useful for conceptualizing basic principles of lung mechanics, such as inspiration and expiration. Additionally, it can assist in understanding the relationship between pressure differentials and lung expansion.
The air remaining in the lung after a maximal expiration is the?
residual volume
What is inspiratory flow rate?
Inspiratory flow rate refers to the rate at which air is taken into the lungs during inhalation. It is typically measured in liters per minute and can vary depending on factors such as lung function and respiratory conditions. Changes in inspiratory flow rate can help in diagnosing and monitoring lung diseases.
How can PFT help distinguish whether a lung disease is obstructive restrictive or both?
In obstructive lung disease airways are narrowed which results in resistance to air flow during breathing. In restrictive lung disease, expansion of the lung is limited by disease that affects the chest wall, pleura, or lung tissue itself.
How can PFTs help to distinguish whether a lung disease is obstructive restrictive or both?
In obstructive lung disease airways are narrowed which results in resistance to air flow during breathing. In restrictive lung disease, expansion of the lung is limited by disease that affects the chest wall, pleura, or lung tissue itself.
