alveolar fluid
1) Surfactant keeps it from collapsing completely, but 2) Air pressure inflates it beyond the minimum (the lower pressure around it is developed by the chest wall & the diaphragm.)
The force that keeps us on Earth is called gravity. It is the force of attraction between objects with mass, such as the Earth and everything on its surface.
The gravitational pull keeps the Earth's atmosphere close to the surface...
It is the pick guard. It keeps your pick from scratching the guitar's surface.
The extracellular matrix is the sticky coating on the outside of cells that keeps them joined together.
The extracellular matrix is the sticky coating on the outside of cells that keeps them joined together.
The extracellular matrix is the sticky coating on the outside of cells that keeps them joined together.
The extracellular matrix is the sticky coating on the outside of cells that keeps them joined together.
Friction is the force that keeps you from sliding on an icy sidewalk. When you walk, the friction between the soles of your shoes and the ice surface prevents you from slipping.
Gravity
Surface tension keeps water on a penny even when it goes over the surface of the penny and you think it would spill over the edge due to gravity. I believe surface density is accomplished due to the fact that the hydrogen bonds, for that scale, is stronger than the force of gravity. For more information look at the Related Links below.
Cells are limited in size due to the surface area-to-volume ratio. As a cell grows, its volume increases faster than its surface area, leading to struggles in nutrient and waste exchange. This limitation imposes a cap on cell size to maintain proper functioning.