Water - Leaving Cert - Revision Notes - Biology

Overview

• Water constitutes 60% of the human body's mass and 90% of most plants' mass.

Importance of Water

1. Medium for Chemical Reactions
   • Facilitates various biochemical reactions essential for life.
2. Component of Blood
   • Plays a critical role in transporting nutrients and waste products throughout the body.
3. Regulation of Body Temperature
   • Absorbs and releases heat slowly, preventing sudden changes in body temperature.
   • Assists in cooling the body through mechanisms like sweating.
4. Excellent Solvent
   • Dissolves a wide range of substances, which is essential for biological functions.

Key Revision Questions

1. Why is Water Essential for Living Organisms?

   • Regulates blood pressure.
   • Acts as a reaction medium.
   • Absorbs sound waves.
   • Increases body mass.

2. How Does Water Regulate Body Temperature?

   • Absorbs and releases heat slowly.
   • Promotes sweating to aid in cooling.

Additional Information

• Water helps maintain stable body temperatures by its ability to absorb heat and release it gradually.
• It plays a vital role in cooling mechanisms such as sweating.

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