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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.
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What pressures vary rhythmically with respiration?
both intrapleural pressure and intra-alveolar pressure.
The typical cell making up the alveolar wall is the?
The alveolar sac, also called an alveolus, is lined by cells called type I pneumocytes.
What produces surfactant?
type II alveolar cells
Can plant cells have negative turgar pressure values?
Plant cells are not known to have negative turgor pressure values. However, there are times when plants will have low turgor pressures which may result into negative turgor pressure values.
Why does Values are outside the normal range indicate disease?
Values outside of the normal range always indicates the presence of disease?
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 also known as the intra-alveolar pressure?
Intra-alveolar pressure is also known as the machinal chain.
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 pressures vary rhythmically with respiration?
both intrapleural pressure and intra-alveolar pressure.
What is normal pressure for the eye?
Atmospheric Pressure - 100 000 Pa or 1 Bar
What is an alveolar rupture?
An alveolar rapture refers to a situation where the alveolus raptures as a result of increased trans alveolar pressure with less pressure in the adjacent intestinal space. The rapture is dangerous because the amount of pulmonary congestion or obstruction that prevents the expansion of the lung is immeasurable, thereby leaving no criteria for safe pressures.
What is the normal partial pressure of blood for nitrogen?
In alveolar air its 569.0 mm Hg. In expired air its 566.0 mm Hg. This is per Guyton & Hall's Textbook of Medical Physiology (1996)
The typical cell making up the alveolar wall is the?
The alveolar sac, also called an alveolus, is lined by cells called type I pneumocytes.
How does pneumothorax affect lung pressure and aleveolar pressure when inspiratory muscles contract?
A pneumothorax is air in the plural cavity. When a person takes a breath the lung cannot expand. This expatiation normal lowers the pressure in the lungs allowing air to move into the longs, without expatiation during inspiration the pressure does not change and air will not move in.
How do the structures of alveoli and capillaries support the function of gas exchange?
Exchange of gases in alveoli takes place through diffusion. This diffusion takes place to partial pressure differences among the gases O2 and CO2. The partial pressure of O2in alveolar sac = 103 mm Hg The partial pressure of O2 in blood = 50mm Hg The partial pressure of CO2 in alveolar sac = 28 mm Hg The partial pressure of CO2 in blood = 45 mm Hg As a result, the O2 from alveolar sacs diffuses into blood. the CO2 diffuses from blood into lungs.
When intraalveolar pressure exceeds atmospheric pressure what happens?
intrapleural pressure exceeds atmospheric pressure, but lungs don't collapse because intra-alveolar pressure increases, too (4 mmHg pressure gradient stays same)
