Kidneys. Artwork of an upper body outline showing the positions of the kidneys (red) and adrenal glands (above kidneys, orange). Kidneys serve to filter blood to remove excess water, salts and waste products. These are excreted as urine and pass along the ureters (below kidneys, orange) to the bladder (not seen). The kidneys regulate the balance between the blood's fluid and salts, and its acidity level. The adrenal gland's inner portion (medulla) secretes the hormone adrenalin (epinephrine) in times of stress to prepare it for physical exertion. The outer portion (cortex) produces about 30 steroid hormones that regulate metabolism.
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