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- Homeostasis is maintained by the exchange of substances between different environments of the body.
- The integumentary system covers the outer surface of the body.
- The integumentary system protects the internal environment from harmful external agents.
- The respiratory system allows oxygen (O₂) to enter blood plasma from the external environment.
- The digestive system allows nutrients to enter blood plasma from the external environment.
- The cardiovascular system transports oxygen and nutrients throughout the body.
- Blood capillaries are the smallest blood vessels in the body.
- Blood capillaries allow exchange between blood plasma and interstitial fluid.
- Oxygen and nutrients move from blood plasma into interstitial fluid.
- Cells take in oxygen and nutrients from interstitial fluid.
- Cells use oxygen and nutrients for metabolism to produce energy.
- Cells produce waste products during metabolic processes.
- Waste products move from cells into interstitial fluid.
- Waste products then enter blood plasma by crossing capillary walls.
- The cardiovascular system transports waste products to organs for elimination.
- Carbon dioxide (CO₂) is removed from the body by the respiratory system.
- The urinary system eliminates nitrogen-containing wastes from the body.
- Examples of nitrogen-containing wastes include urea and ammonia.
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