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figure education parasympathetic nervous system vagus nerve sympathetic vasoconstriction arcuate plexus blood flow renal sinus major calyx minor interlobular artery column pyramid corpuscle cortex osmosis osmolality nephrons nephron glomerulus acid base balance toxin removal bladder urine ureter retroperitoneal space human body anatomy medical health science medicine biology vector organ healthy internal anatomical graphic isolated kidney fluids fluid electrolyte toxins