Hydration supports the work of every cell, tissue, and organ. In this lesson, you will explore how water functions in the body, how to recognize hydration needs, and how to consider water safety and the needs of older adults.
Water is the body’s universal solvent: many substances dissolve in it. Blood, which is largely water, transports dissolved nutrients and other essential substances to cells. It also carries waste products away for elimination. Because cells, tissues, and organs depend on these processes, adequate hydration is important for health.
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Why is water called the body’s universal solvent?
Many substances dissolve in water. In the watery blood environment, dissolved substances can be transported to cells, while waste products are carried away for elimination.
What are the cited general daily water recommendations for women and men?
About 11.5 cups per day for women and 15.5 cups per day for men, counting water from both foods and beverages. Since about 20% commonly comes from food, approximate beverage-fluid amounts are 9 cups for women and 13 cups for men.
Why can older adults need support to maintain hydration?
Thirst may diminish with age, and some older adults intentionally drink less to avoid frequent bathroom trips. Encouraging and offering fluids can help support intake.
What can urine color suggest about hydration?
Darker urine can indicate a greater need for fluids. It is a useful clue, but hydration should not be assessed using urine color alone.
How do boiling and filtration differ in water treatment?
Boiling can kill many microorganisms. It does not remove chemicals or heavy metals; an appropriate filter is needed for those contaminants.
Quiz questions
What is one major function of water in the body?Answer: It helps blood transport dissolved substances to cells and carry waste away.
Which agency monitors U.S. municipal water supplies?Answer: The Environmental Protection Agency.
When may electrolyte-containing sports drinks be useful for adults?Answer: After intense exercise, especially when it is vigorous and prolonged.
Which figures are the cited approximate beverage-fluid recommendations after accounting for water from food?Answer: About 9 cups for women and 13 cups for men per day.
Which statement about plain water is accurate?Answer: It provides fluids but contains no calories.
Based on Nutrition for Nurses by Emerald Charity Bilbrew, Jody Vogelzang, Kelli Whittington (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.