All living things need water. The Earth is full of water. Water is the most essential element, next to air, to our survival. Water makes up more than two thirds of the weight of the human body, and without it, we would die in a few days. There are many water importances in our life to complete daily life and to maintain we body health.
Humans and other creatures must drink water to avoid dehydration. Dehydration is defined as a loss or insufficient levels of water and important blood salts like potassium and sodium in your body. Important organs like the kidneys, brain, and heart cannot function properly without water and salt. Signs of dehydration include fuzzy short-term memory, trouble with basic math, and difficulty focusing on computer screen will occur if less water in the body.
Water also importance in homeostasis process to maintain the relatively constant temperatures within the body. This is important because it means that sudden changes in the temperature, which may upset metabolic reactions in cells, are avoided. These chemical reactions are allowed to take place within a narrow temperature range so that rates of reaction are more constant.
Water has been called a universal solvent because of it polarity. This means many compounds, whether ionic, polar or covalent will dissolve in it, therefore more reactions take place while in solution with water. Human digestion will only dissolve soluble foods, meaning large starch molecules must be broken down into soluble sugars. Also many organisms living in water spend most of their time underwater, yet they require oxygen to respire, and as water is such a good solvent the required oxygen gas is dissolved in the water.