ANATOMY

Detailed explanation-1: -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-2: -The next step in urine formation is tubular secretion. Here, tubular cells secrete substances like hydrogen ions, potassium ions, etc into the filtrate. Through this process, the ionic, acid-base and the balance of other body fluids are maintained. The secreted ions combine with the filtrate and form urine.

Detailed explanation-3: -There are three main steps of urine formation: glomerular filtration, reabsorption, and secretion. These processes ensure that only waste and excess water are removed from the body.

Detailed explanation-4: -Tubular secretion is one of many steps in the process of filtering blood to produce liquid waste in the form of urine. Within the excretory system of many organisms, this is important for both waste removal and acid-base balance.

Detailed explanation-5: -Tubular reabsorption is the second major step in urine formation. Most of the reabsorption of solutes necessary for normal body function such as amino acids, glucose, and salts takes place in the proximal part of the tubule.