APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -The filtrate absorbed in the glomerulus flows through the renal tubule, where nutrients and water are reabsorbed into capillaries. At the same time, waste ions and hydrogen ions pass from the capillaries into the renal tubule. This process is called secretion.

Detailed explanation-2: -During urine formation, the tubular cells secrete substances like hydrogen ions, potassium ions and ammonia into the filtrate. This process is called tubular secretion.

Detailed explanation-3: -Urine is formed in three main steps-glomerular filtration, reabsorption and secretion. It comprises 95 % water and 5% wastes such as ions of sodium, potassium and calcium, and nitrogenous wastes such as creatinine, urea and ammonia. Osmoregulation is the process of maintaining homeostasis of the body.

Detailed explanation-4: -Secretion involves the transfer of hydrogen ions, creatinine, drugs, and urea from the blood into the collecting duct, and is primarily made of water. Blood and glucose are not normally found in urine.