Chapter 7. The Urinary System How and Why urine is secreted from the body. The Human Body. The Human body is an integrated, intricate system .
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Human waste takes the form of FECESas food passes through the digestive system. CARBON DIOXIDE as we exhale through the respiratory process and URINATE as one expels urine through the act of VOIDING (expelling urine through the urethra).
When food containing protein is used by cells in the body waste products containing nitrogen are released into the bloodstream. One of these nitrogenous waste products, Urea, is removed from the body through the urinary system.
The substances that are NOT REABSORBED BACK INTO THE BODY are secreted out of the body, (tubular secretion). These substances move from the renal tubules, into the renal pelvis, which narrows into the ureter.