Lecture 1 CHEMICAL COMPOSITION OF PLANT AND ANIMAL BODIES Plant and Animal bodies consists of: Water Organic acids (carbohydrates, lipids, proteins, complexes.

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Presentation transcript:

Lecture 1 CHEMICAL COMPOSITION OF PLANT AND ANIMAL BODIES Plant and Animal bodies consists of: Water Organic acids (carbohydrates, lipids, proteins, complexes of lipids, proteins and carbohydrates, Nucleic acids and vitamins) Inorganic salts (minerals) Water Constitutes 50% -60% of body mass of adult animals, higher amount is found in newborns. Functions of water are 2 fold: (a) It performs a key role in body metabolism since all biochemical reactions in the body require water. Water acts as a solvent, a transport medium for dissolved substances in blood, tissue fluids etc. It is a component in many chemical reactions such as hydrolysis and oxidation (b) It also helps in maintaining body temperature through evaporative cooling, blood flow etc. In animals, water is supplied as: Drinking water Water in feeds Water from metabolic reactions e.g. water associated with fat or protein breakdown (negative energy balance). In plants, water is absorbed from: The soil or The atmosphere.