13b - Distribution and Constituents of Fluids P3 M2

2891 Words Jun 28th, 2015 12 Pages
13B – Distribution and constituents of fluids

P3: Distribution and constituents of body fluids –
M2: Explain functions of the constituents of body fluids -

Constituents of body fluid -

The human body consists mostly of water, and is a major constituent to the human body and vital organs; of this 90% include blood plasma, lymph, urine, saliva, digestive juices, bile, cerebrospinal fluid and tissue fluid. Water enables substances to be transported throughout the body, red blood cells for example, as wells as supplying the medium required for metabolic reaction to take place (respiration). Without water the progression of these fluids would not be possible. Water is constantly being transported between the fluid compartments of
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Acids, bases and salt –

Acids are a substance that has a pH less than 7. There are two different types of acid:

• Weak acid – An organic compound with a minimal amount of dissociated molecules
• Strong acid – An organic compound with a large amount of dissociated molecules

Acids are a corrosive substance with a pH less than 7. Acidity is caused by a high concentration of hydrogen ions.

Bases are a substance with a pH higher than 7, and have a high concentration of hydroxyl ions. Bases can react with acids in order to neutralise them in order to form salt and water. Bases are normally metal oxides or metal hydroxides. Sodium hydroxide for example is a base.

Acids react with reactive metals in order to make a salt. Salts are a compound formed by the neutralisation of an acid by a base, for example metal oxide. This is a result of hydrogen atoms in an acid being replaced by positive ions.

Bases that have are able to dissolve into water are known as alkalis. Sodium hydroxide is an alkali as it dissolves in water, copper oxide cannot dissolve water therefore is not an alkali.

Hydrochloric acid is produced in the stomach, consisting of chloride and hydrogen. Carbonic acid is produced in red blood cells consisting of carbon dioxide and water, of which is why demanding