**Functions of Water**

Water is an essential resource for all living organisms. It plays a vital role in various bodily functions and supports the survival of all life forms. Let's delve into the five functions of water in detail:

**1. Hydration and Temperature Regulation:**
- Water helps to maintain the body's fluid balance, preventing dehydration. It is necessary for the proper functioning of cells, tissues, and organs.
- Water regulates body temperature through sweating. When we sweat, water on the skin's surface evaporates, cooling down the body.

**2. Transport of Nutrients and Waste:**
- Water acts as a medium for transporting nutrients, such as vitamins, minerals, and glucose, to different parts of the body. It helps in the absorption and distribution of these essential substances.
- It also aids in the removal of waste products, such as urea and carbon dioxide, through urine and sweat. Water helps in the filtration and excretion processes of the kidneys.

**3. Lubrication and Cushioning:**
- Water acts as a lubricant for various bodily functions. It keeps joints lubricated, allowing smooth movement and reducing friction between bones.
- It also lubricates the digestive system, aiding in the breakdown and absorption of food. Water helps in the production of saliva, which initiates the digestion process.
- Water acts as a cushioning agent around vital organs, such as the brain, spinal cord, and heart, protecting them from shock and impact.

**4. Chemical Reactions and Metabolism:**
- Water is involved in numerous chemical reactions that take place in the body. It acts as a solvent, dissolving various substances, and enabling them to react chemically.
- It plays a crucial role in the metabolic processes of the body, including the breakdown of food, production of energy, and elimination of waste products.
- Water is essential for the proper functioning of enzymes, which are catalysts that speed up chemical reactions in the body.

**5. Support in Plant Life:**
- Water is vital for plant growth and survival. It is absorbed by the roots and transported through the stems to different parts of the plant.
- Water provides structural support to plants, allowing them to maintain rigidity and stand upright. It helps in maintaining turgidity, preventing wilting and drooping of leaves.
- Water also aids in the process of photosynthesis in plants, where it acts as a medium for the exchange of gases and transportation of nutrients.

In conclusion, water serves several crucial functions in both human and plant life. It is essential for hydration, temperature regulation, nutrient transport, waste removal, lubrication, cushioning, chemical reactions, metabolism, and plant support. Its significance cannot be overstated as it is a fundamental element for the survival and well-being of all living organisms.