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they are one cell thick.
Artery -> Arteriole -> Capillary -> Venule -> Vein
Two ways in which the structure of a capillary is adapted to its function is to encourage the exchange of oxygen. Another reason is to encourage the exchange of carbon dioxide.
Capillary
Increasing surface area via capillary action
Capillary action can refer to the movement of water and fluids vertically and throughout the structure of a plant. An example is: "Water movement can be transported upwards in a plant against the force of gravity because of capillary action."
The respiratory membrane is formed by a combination of the walls of alveoli and walls of capillaries. It consists of type 1 alveolar cells, a basement membrane, capillary endothelium, alveolar epithelium and macrophages.
they allow two-way flow
A capillary viscometer is constructed from glass. Glass blowers make different styles of capillary viscometers with specific bulb and capillary diameters. These dimension determine the viscosity range of liquids which can be tested.
it has a single tunic- only the tunica interna
It is not easy to be cleaned inside.
there is a aveolar wall, capillary wall, sqamous epithelium tissue, and blood inside the walls.