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During expiration, alveolar pressure increases as the diaphragm and intercostal muscles relax, causing the lungs to contract. This rise in pressure exceeds atmospheric pressure, leading to the expulsion of air from the lungs. Typically, alveolar pressure during expiration can reach around +1 to +2 mmHg above atmospheric pressure, facilitating airflow out of the respiratory system.
What else can I help you with?
During expiration the alveolar pressure must be?
During expiration, the alveolar pressure must exceed atmospheric pressure to allow air to flow out of the lungs. This is achieved by the contraction of the diaphragm and intercostal muscles, which reduces the volume of the thoracic cavity and increases the pressure within the alveoli. As a result, air is expelled from the lungs until the pressures equalize again.
Is Alveolar recoil lead to a decrease in intr-alveolar pressure?
NO
What is intra-alveolar surface tension due to?
Intra-alveolar surface tension is due to the presence of surfactant molecules that reduce surface tension within the alveoli, preventing lung collapse by maintaining alveolar stability during breathing. Surfactant helps to reduce the work of breathing and facilitates gas exchange by preventing alveolar collapse at the end of expiration.
How does one calculate alveolar carbon dioxide partial pressure?
Alveolar carbon dioxide partial pressure can be calculated using the alveolar gas equation: PaCO2 = (Pb-PH2O) * FiCO2 - (PaCO2 / R), where PaCO2 is the alveolar partial pressure of carbon dioxide, Pb is barometric pressure, PH2O is water vapor pressure, FiCO2 is inspired fraction of CO2, and R is the respiratory quotient. This equation helps estimate the partial pressure of CO2 in the alveoli.
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
During expiration the alveolar pressure must be?
During expiration, the alveolar pressure must exceed atmospheric pressure to allow air to flow out of the lungs. This is achieved by the contraction of the diaphragm and intercostal muscles, which reduces the volume of the thoracic cavity and increases the pressure within the alveoli. As a result, air is expelled from the lungs until the pressures equalize again.
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 is the concept of equal pressure point?
Equal pressure point (EPP) is the point where Intrapleural pressure and Alveolar pressure are equal. This is similar to the Starling resistor concept in the lung. Instead of flow being determined by the difference between alveolar and mouth pressure- flow is determined by the difference between alveolar and Intrapleural pressure difference. In forced expiration, both intrapleural pressure and alveolar pressure will increase. However alveolar pressure will decrease along the length of the airway until a pressure of zero at the mouth, whereas intrapleural pressure will remain the same. Therefore there will be a point where intrapleural pressure will be equal and subsequently greater than alveolar pressure. If the EPP occurs in the larger cartilaginous airways, the airway remains open. However, if the EPP is in the smaller airways, it will collapse. Increasing the force of expiration does not overcome EPP since it will increase both alveolar and intrapleural pressure. Another interesting concept is that EPP moves distally as expiration progresses because as air leaves the alveolar unit, the pressure in the alveolar decreases hence the pressure in the airway decreases as well. EPP is the cause of dynamic airway compression.
What is also known as the intra-alveolar pressure?
Intra-alveolar pressure is also known as the machinal chain.
Expiration depends on what two factors?
Expiration depends on (1) the recoil of elastic fibers stretched during inspiration and (2) the inward pull of surface tension from the film of alveolar fluid.
Is Alveolar recoil lead to a decrease in intr-alveolar pressure?
NO
What is also known as the intra alveolar pressure?
Intra-alveolar pressure is also known as the machinal chain.
What is intra-alveolar surface tension due to?
Intra-alveolar surface tension is due to the presence of surfactant molecules that reduce surface tension within the alveoli, preventing lung collapse by maintaining alveolar stability during breathing. Surfactant helps to reduce the work of breathing and facilitates gas exchange by preventing alveolar collapse at the end of expiration.
When is the intrapleural pressure become positive?
Intrapleural pressure becomes positive during forced expiration or coughing when the muscles contract forcefully to increase the pressure within the thoracic cavity. This positive intrapleural pressure helps to push air out of the lungs.
What are the normal values for alveolar pressure?
For air flow: F=(P_alveolar -P_atmosphere)/R When there is no air flow F= 0 and then P_alveolar -P_atmosphere=0, so they equal each other. Hence the Alveolar pressure is equal to that of the atmosphere, between a breathing cycle.
How does one calculate alveolar carbon dioxide partial pressure?
Alveolar carbon dioxide partial pressure can be calculated using the alveolar gas equation: PaCO2 = (Pb-PH2O) * FiCO2 - (PaCO2 / R), where PaCO2 is the alveolar partial pressure of carbon dioxide, Pb is barometric pressure, PH2O is water vapor pressure, FiCO2 is inspired fraction of CO2, and R is the respiratory quotient. This equation helps estimate the partial pressure of CO2 in the alveoli.
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
