One piece of hydraulic equipment will commonly have both tube and hose assemblies on it, depending on which solution better serves each particular part of the system. For example, tube would typically be better when routed close to a heat source, and hose would be chosen for high vibration applications or when attached to moving parts.
Cochlear fluids. The cochlear canals contain two types of fluid: perilymph and endolymph. Perilymph has a similar ionic composition as extracellular fluid found elsewhere in the body and fills the scalae tympani and vestibuli. Endolymph, found inside the cochlear duct (scala media), has a unique composition not found elsewhere in the body. Composition of the cochlear fluids A remarkable characteristic of the cochlea is the unique composition of endolymph.
As the stapes moves, it pushes a structure called the oval window in and out. This action is passed onto the cochlea, which is a fluid-filled snail-like structure that contains the receptor organ for hearing. The cochlea contains the spiral organ of Corti, which is the receptor organ for hearing. It consists of tiny hair cells that translate the fluid vibration of sounds from its surrounding ducts into electrical impulses that are carried to the brain by sensory nerves.