The Importance Of Water In Biology

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Overall, these properties allow it to: provide habitats for animals; transport substances around organisms; regulate and participate in cell reactions and help animals maintain a constant blood temperature.
Water’s small size is important for plants as it is able to diffuse by osmosis into plant cells which creates turgor as the vacuole swells pressing against the cell wall. This pressure helps plants stand up straight and not wilt causing death
As water is lost by transpiration from the leaves tension is created in the mesophyll cells causing the water droplets to move up the stem to the leaves against gravity. This is called capillary action and provides leaves with water for photosynthesis. This is a very important process for the existence
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This is cohesion and means that water can form droplets. Cohesion also creates surface tension between water molecules, which resists objects entering it
In the small intestine the villi are moist allowing the products of digestion to dissolve so they can be more easily absorbed. This helps to provide the reactants for metabolic reactions at a faster rate. Another place where this is important is the alveoli. The moist cells allow oxygen and carbon dioxide to dissolve and diffuse faster which is very important whilst exercising to get enough oxygen to the respiring muscles.
In humans, water is involved in hydrolysis reactions releasing glucose from glycogen by the addition of a water molecule. This reaction and the reverse are essential for the regulation of blood sugar levels, without which they would become too high or low causing fainting. It also aids in the folding of proteins as the hydrophobic end folds inside, away from the water in the cytoplasm, whilst the hydrophilic end is on the
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This is because the anions are attracted to the positive hydrogen and the cations are attracted to the negative oxygen causing the compound to dissociate. It is therefore a large component of blood plasma as it is very useful for transporting salts around the body.
This means that water below 3OC, which is less dense, rises to the surface and solidifies. This ice layer insulates the water preventing it from freezing
Below this temperature, it is harder to form hydrogen bonds and so there is more space between molecules
In the Arctic, water provides habitats for marine life, like whales, whilst polar bears live on the ice. The abnormal density of water allows both states to simultaneously exist, as water is densest at 4OC because the molecules are arranged in a tetrahedral pattern held together by hydrogen bonding
The transparency of water allows light to reach coral, which contain photosynthetic algae, 20m deep. The algae photosynthesise providing glucose for the coral polyp, which is important for habitats for other aquatic life. The low boiling point means that mammals, like dogs, produce sweat to cool themselves down to prevent cells overheating causing proteins to

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