surfactant
Surfactant is a substance which lines the inside of alveoli. It is composed of a phospholipid bilayer, which have hydrophyllic and hydrophobic properties. This allows it to reduce surface tension.
Lung compliance is determined by the elasticity of the lung tissue and the surface tension of the alveoli. Compliance decreases with conditions that stiffen the lung tissue, such as fibrosis, or increase surface tension, such as pulmonary edema. Compliance also decreases with aging and certain diseases like chronic obstructive pulmonary disease (COPD).
Surfactants, which are molecules that lower surface tension, can be found in serous fluid. These molecules help prevent alveoli in the lungs from collapsing by reducing the surface tension of the fluid lining the alveoli.
surface tension decreases with the increase of temperature
As the temperature rises, surface tension decreases.
False
They produce surfactant, a substance that reduces surface tension. Alveoli are very small, only 80 nanometers wide, and are flat. Therefore they have a tendency to curl up. The surfactant reduces this tendency, hence keeps the alveoli from collapsing.
Alveoli does not collapse because lungs always have a residual volume which prevents the alveoli to collapse.
it decreases it.
The wet surfaces of the alveoli stick together primarily due to surface tension, which is the tendency of liquid surfaces to shrink and minimize their area. This surface tension is caused by the cohesive forces between water molecules lining the alveoli. To counteract this, the alveoli produce a substance called surfactant, which reduces surface tension and prevents the alveoli from collapsing, allowing for efficient gas exchange during respiration.
Surfactant, a substance produced by type II alveolar cells in the lungs, reduces the surface tension of fluid in the alveoli. This helps to prevent the collapse of alveoli during expiration and facilitates the exchange of gases in the lungs.
An increase in temperature typically decreases surface tension in liquids. This is because higher temperature leads to increased molecular motion, which weakens the intermolecular forces responsible for surface tension.