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The Biological importance of water as a solvent and as a medium for living organisms

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Introduction

The Biological importance of water as a solvent and as a medium for living organisms. Water is possibly the most important substance life as we know it, as we need in order to survive; it also provides an environment for many species. All cells contain a minimum of 85% of water, with most fluids inside and outside of the cell likely to have at least 90% water. Both transportation of molecules and chemical reactions take place in dissolved water. In chemical terms, the water molecule is strongly dipolar, this property makes water a very effective solvent, particularly for crystalline salts .So, water is the solvent of the body & it regulates all functions, including the activity of everything it dissolves & circulates. ...read more.

Middle

Hydrogen bonds stick to each other, i.e. they are Cohesive, and this cohesion holds the molecules together when they move, meaning that water and dissolved substances can be moved in a cell with ease, these dissolved substances and water are moved around organisms via these transport systems. Not only is water an important solvent, but it is also an essential medium for living organisms. It is important in two ways- * It is essential for survival * It provides an environment for many species. In terms of survival, water does 2 important things. It acts as a supporter, and a heat holder. As water stays as a liquid at the temperature and pressure that organisms live at, increasing the pressure will not reduce the volume of water; this means that it will allow transport systems to pump (transfer) ...read more.

Conclusion

In order to lose this heat mammals produce sweat, when the water in the sweat evaporates, heat is taken away from the body in large amounts. Water also has a high latent heat of fusion; this simply means that water will lose a large amount of heat, before it turns into ice. This is important as the specific heat capacity of water is very important in order to maintain the temperature of living organisms, including their environment. Water also provides a vast environment for many species, as it covers the majority of the Worlds surface, an estimated 1.4 billion cubic kilometers. The majority of the species that live in water also use it as a source of oxygen, for example most fish use gills to get dissolved oxygen from the surrounding water. ...read more.

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