1. What is the approximate percentage (in mass) of water in the human body? Do you think this percentage is larger in adults or in the elderly? 2. What are the main biological functions of water? 3. Water plays a key role in organic reactions. What are examples of two types of organic reactions in which water is either an input or an output? 4. Is water a polar or a non-polar molecule?1 What does that mean for water’s function as a solvent? 5. Which kind of polarity do water-soluble and fat-soluble substances demonstrate? 6. What is the importance of water for enzyme activity? 7. Does water have a small or large heat capacity? What is the biological significance of this characteristic? 8. What are the main properties of water that make it so special for life? 9. What are ions? What are the two types of molecules into which ions are classified? 10. What are the main positive ions found in living organisms? 11. What are the main negative ions found in living organisms? 12. What is the role of mineral salts in osmotic regulation? 13. . What is the role of mineral salts in the creation of electric tension (voltage) at the cellular level? 14. Why is pH regulation important for living beings What is the role of mineral salts in this regulation? 15. What are the main biological processes in which calcium is involved?

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