ANATOMY

Detailed explanation-1: -Tubular secretion is the transfer of materials from peritubular capillaries to the renal tubular lumen; it is the opposite process of reabsorption. This secretion is caused mainly by active transport and passive diffusion. Usually only a few substances are secreted, and are typically waste products.

Detailed explanation-2: -Each nephron includes a filter, called the glomerulus, and a tubule. The nephrons work through a two-step process: the glomerulus filters your blood, and the tubule returns needed substances to your blood and removes wastes.

Detailed explanation-3: -The proximal tubule of the nephron-This is the correct answer. Secretion occurs in the proximal tubule section of the nephron and is responsible for the transport of certain molecules out of the blood and into the urine.

Detailed explanation-4: -The nephrons of the kidneys process blood and create urine through a process of filtration, reabsorption, and secretion.