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The biological importance of water.

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The biological importance of water. Water is a key factor in our life and despite it being only a simple molecule, it is vital for life. Without water any life would not exist on earth as it makes up about 60% of the body weight of humans and in all living cells alone it makes up 70-95% of the mass in the cell. This means that water is the main constituent of all organisms. In jellyfish, water makes up 96% of its body mass but in herbaceous plants water makes up 90% of the mass. Water is the most abundant liquid on earth, which isn't surprising when it's seen that two thirds (or more), in active living cells is made up of water, and that two-thirds of the world is covered by water too. Our body takes in water by various different ways, by food (800), by drinking (1450), and by respiration (350). We take in roughly 2600cm3 of water per day. We release water from our body by urine (1500), sweat (600), evaporation from lungs (400), and in our faces (100). ...read more.


Water is also used in the process of transport. Substances which organisms produce often need to be transported to different places in the organism. Blood is used in humans and animals to transport various substances round the body. E.g. hormones, oxygen, waste products etc. Sap is used in plants to transport food similar substances around the plant. Water plays a big part in this transportation method as blood and sap are mainly made up of water and the water dissolves the products that need to be transported. Water can also be used as a mechanism of support. Water van enter and exit animal and plant cells by the process of osmosis. However if too much water enters animal cells they are likely to burst, but due to plant cells having the additional cell wall they don't break and instead become flaccid. When plant cells take in water up to a point where no more water can enter the cell, the cell wall exerts a wall pressure, which resists any further entry of water by osmosis. ...read more.


This glucose is then wither used for respiration or stored in the plant cells as starch. If we didn't have water neither of these two extremely important reactions could take place and life would not be able to continue, as the oxygen produced by respiration in plants is vital in humans for respiration. Water is also transparent. This is another important property as it means that sunlight can pass through it. This means that plants in water can photosynthesise and on a much greater scale. The process of hydrolysis is when water is used to break up molecules by simply adding water. This process is vital for animals and plants as it means that they can make use of stored foods that are in long chains. It does this by breaking them up into smaller molecules. Water is also useful as it can produce energy by oxidising hydrogen from water. Energy is useful for all processes. Overall water has a great biological importance, and this is mainly due to its unique structure. There is no other substance like it or even similar and so its originality makes it even more vital in our bodies. ...read more.

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