This chapter examines the shift of water among body fluid compartments and the consequences in the plasmatic concentrations of the plasmatic proteins concentration and the hematocrit. Examples of non-physiological and some pathological conditions are used.

Calculation of the water deficit by using the standard formula available from Adrogue, HJ; and Madias, NE. Primary Care: Hypernatremia. New England Journal of Medicine 2000; 342(20):1493-1499. Use the following Link: MedCalc: Hyponatremia & Hypernatremia

Is the interstitial space a new organ? Is it something new?

Read this paper and think: https://www.nature.com/articles/s41598-018-23062-6

See the discussion in: https://twitter.com/neiltheise/status/978585229815418880

Solution, Colloid and Suspension

A solution is always transparent; light passes through with no scattering from solute particles, which are molecule in size. The solution is homogeneous and does not settle out. A solution cannot be filtered but can be separated using the process of distillation.

A suspension is cloudy and heterogeneous. The particles are larger than 10,000 Angstroms, which allows them to be filtered. If a suspension is allowed to stand, the particles will separate out.

A colloid is intermediate between a solution and a suspension. While a suspension will separate out a colloid will not. Colloids can be distinguished from solutions using the Tyndall effect. Light passing through a colloidal dispersion, such as smoky or foggy air, will be reflected by the larger particles and the light beam will be visible. A hydrocolloid can simply be defined as a substance that forms a gel when it is exposed to water. Such substances include both polysaccharides and proteins.