A normal functioning circulatory system is essential for the kidneys to operate, i.e. when blood pressure falls below a given level no urine can be formed. Heat formed in the viscera, heart, and skeletal muscles is distributed to the periphery (i.e. shell) of the body by the circulation in a closely regulated manner. Breaks or leaks in the plumbing of the circulatory system are stopped by the process of hemostasis, or blood clotting.
The interstitial fluid is stirred and renewed in a process discovered by Starling and Landis. Again, the circulatory system is essential for this to occur. Because approximately 1% of our bodies' erythrocytes are destroyed and produced each day, mechanisms for transport and conservation of the iron in the hemoglobin evolved. These are intimately involved with the circulation. Erectile organ function depends upon engorgement with blood and availability of adequate blood pressure. Many other minor functions of the circulation could be mentioned.
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