
Water's necessity does not end with humans. In fact, water is quintessential part of most living organisms. Even the plants need water. There is more animal and plant life found in water than on land and in air collectively.
For humans water is so important because it's used in so many activities. We need to drink water to survive and to stay healthy. We need water for bathing, cleaning and washing. We need water for cooking. Water is in the form of milk, fruits, meats, vegetables, and even in stones.
Inside our body, water helps regulate human body's temperature. Water is nature's air conditioner inside our body; when it's hot, water keeps the body cool through perspiration, and when it's cold, water keeps the body warm through insulation. Through balancing the electrolytes, water controls and regulates the blood pressure. Water forms a big and important portion of human saliva, sweat and tears, and all these are important for proper body functions. It keeps the moisture intact around mouth and eyes.
Our joints move painlessly only because the water works as a lubricant on them. Water, through its presence in and around the organs, cushions them from any outside jolt. It also works as an excreting agent in our body by flushing human kidneys.
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