crossword

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Across
  1. 1. dioxide – A waste gas produced by cells during metabolism that must be removed from the body
  2. 3. system – The system responsible for transporting oxygen, nutrients, and carbon dioxide throughout the body.
  3. 4. – The gas required by body cells for energy production.
  4. 6. – The widening of blood vessels to release heat and increase blood flow to the skin.
  5. 7. glands – Structures that produce sweat to help cool the body during hot conditions.
  6. 8. system – The system responsible for taking in oxygen and expelling carbon dioxide.
Down
  1. 1. – Specialized sensors that detect changes in oxygen and carbon dioxide levels in the blood.
  2. 2. – The narrowing of blood vessels to conserve heat in cold conditions.
  3. 5. – The body’s ability to maintain a stable internal environment despite external changes.