Bodies of Water

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Learning Objectives:

• Explain that the human body is made mostly of water
• Provide an example of the importance of clean water to all living things

Teacher Background:

All animals need water. Some can live in deserts and some animals can only live in very wet places, but clean water is critical for people and animals around the world. Without water, a person can barely survive for three days. This is partially because our bodies are about 70% water, and we need to replenish this water as we lose moisture through the mucus membranes that line our nose, mouth, and lungs, through sweat, and through the removal of wastes. When we don't drink enough water, we become dehydrated. Dehydration can lead to minor headaches and an increased level of fatigue. Serious dehydration can lead to damage to the kidneys and other major organ systems. Typically, a person requires the equivalent of at least 2 8-ounce glasses of water a day to stay healthy. In this lesson, students will learn why water is important to our bodies and complete an activity to demonstrate how much water is in the body.

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