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- Body systems work together to exchange substances and maintain homeostasis.
- The integumentary system covers the outer surface of the body.
- This system protects the internal environment from external damage.
- The respiratory system allows oxygen to enter the blood.
- The digestive system allows nutrients to enter the blood.
- The cardiovascular system transports substances throughout the body.
- Oxygen and nutrients move from blood into interstitial fluid through capillaries.
- Blood capillaries allow exchange between blood plasma and interstitial fluid.
- Cells take in oxygen and nutrients for energy production.
- Cells produce waste products during metabolism.
- Wastes move from cells into interstitial fluid and then into blood plasma.
- The cardiovascular system carries wastes to organs for elimination.
- The respiratory system removes carbon dioxide (CO₂).
- The urinary system removes nitrogen-containing wastes like urea and ammonia.
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