Drag
Drag (Medicine)
Drag (pronounced: /dræɡ/) is a term used in the field of medicine to describe the resistance or friction that occurs when a fluid, such as blood, moves through a tube, such as a blood vessel. The term is derived from the Old English 'dragan', meaning 'to pull'.
Etymology
The term 'drag' has its roots in the Old English word 'dragan', which means 'to pull'. It was first used in the context of medicine in the late 19th century to describe the resistance experienced when a fluid moves through a tube.
Related Terms
- Fluid dynamics: The study of how fluids behave when they are in motion. This is particularly relevant to understanding drag in the context of blood flow in the body.
- Hemodynamics: The study of the forces involved in circulating blood throughout the body. Drag is a key factor in hemodynamics.
- Viscosity: A measure of a fluid's resistance to flow. It is one of the factors that determines the amount of drag experienced by a fluid moving through a tube.
- Laminar flow: A type of flow in which a fluid moves smoothly or in regular paths, in contrast to turbulent flow, where the fluid undergoes irregular fluctuations and mixing. In laminar flow, the speed of the fluid is consistent across any cross-section of the pipe.
- Turbulent flow: A type of flow characterized by chaotic, irregular motion. In turbulent flow, drag is often increased due to the fluid's increased kinetic energy.
See Also
External links
- Medical encyclopedia article on Drag
- Wikipedia's article - Drag
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