Why is the cortex region in the kidney dark in colour
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The kidneys are the main organs of the urinary system. They function chiefly to filter blood in order to remove wastes and excess water. The waste and water are excreted as urine. The kidneys also reabsorb and return to the blood needed substances, including amino acids, sugar, sodium, potassium, and other nutrients. The kidneys filter about 200 quarts of blo,od per day and produce about 2 quarts of waste and extra fluid. This urine flows through tubes called ureters to the bladder. The bladder stores the urine until it is excreted from the body.
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Cortex is brownish-red in color, 1 cm wide and lies beneath fibrous renal capsule. Medullary rays penetrate the cortex, starting from the base of the pyramids (medulla), forming the pars radiate of the cortical lobules. In those lobules, the partes convulutae are located. The dark red spots are the renal corpuscle (glomeruli), the site of ultrafiltration. Between the pyramids of the medulla, the cortical substance lies in the form of renal columns, that extend down to the renal pelvis.
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