It controls the level of blood cells (white blood cells, red blood cells and platelets) it filters the blood and removes any old or damaged red blood cells., It stores bile produced by the liver., they release hormones that regulate blood pressure., It has two main functions: an exocrine function that helps in digestion and an endocrine function that regulates blood sugar., It  contracts and flattens and the chest cavity enlarges., It stores urine, allowing urination to be infrequent and controlled.

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