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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. "
Wiki User
∙ 14y ago
Wiki User
∙ 9y agoDuring expiration, the diaphragm relaxes and pushes upwards. The volume of air in the lungs decreases but pressure increases, and so this causes air to flow out of the lungs.
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Under what internal condition does air tend to flow out of the lungs?
Contraction of the rib cage causes an increase in internal lung pressure that results in the expiration of air from the lungs.
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
How does body get rid of carbon dioxide that has accumulated in the lung?
expiration
What does tar causes?
Tar Causes Lung Cancer.
What causes lung problem for female frog during breeding season?
Female frogs often have lung problems during the breeding season. Frogs copulate in water and females are at risk for drowning during this time.
What is alveolar ventilation refers to?
Alveolar volume is lung capacity. Alveoli are the air sacs in the bronchioles. How much air the lungs hold during both inspiration and expiration is lung capacity which is alveolar volume. Hope this helps
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
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
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.
What part of the lung does capillaries flow through?
They are present in the lung surrounding the alveoli.
