Circulatory System Interactions with Digestive, Respiratory, and Urinary Systems
The circulatory system integrates with other organ systems to maintain homeostasis.
Digestive System
- Delivers oxygenated blood to GI tract for digestion/absorption.
- Transports absorbed nutrients (via portal vein to liver, then systemic circulation).
- Carries hormones (e.g., GLP‑1, CCK) that regulate appetite and glucose.
Respiratory System
- Pulmonary circulation picks up O₂ and offloads CO₂ at alveolar capillaries.
- Systemic circulation delivers O₂ to tissues and returns CO₂ to lungs.
- Ventilation‑perfusion matching optimizes gas exchange.
Urinary System
- Renal blood flow (~20% cardiac output) drives glomerular filtration.
- Kidneys regulate blood volume, electrolyte balance, acid‑base, and blood pressure (RAAS).
- Erythropoietin production stimulates red cell synthesis.
These interactions are dynamic; failure in one system often cascades (e.g., cardiorenal syndrome).
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