Question

Write down the three steps in mechanism of urine formation

Answer 1

There are three main steps of urine formation: glomerular filtration, reabsorption, and secretion.

Glomerular filtration is the first step in making urine. It is the process that your kidneys use to filter excess fluid and waste products out of the blood into the urine collecting tubules of the kidney, so they may be eliminated from your body.

In renal physiology, reabsorption or tubular reabsorption is the process by which the nephron removes water and solutes from the tubular fluid and returns them to the circulating blood

Secretion is the movement of material from one point to another, e.g. secreted chemical substance from a cell or gland. In contrast, excretion, is the removal of certain substances or waste products from a cell or organism

Answer 2

Answer:-

The 3 steps by which Urine Formation take place :-

• Glomerular filtration,
• Glomerular filtration,Reabsorption.
• Secretion.

Explanation:-

$\bigstar$ Glomerular Filtration:-

The Glomerulus Filters Water and Other Substances ,Blood flow through the glomerulus as part of filtration Each kidney contains over 1 million tiny structures called nephrons. Each nephron has a glomerulus, the site of blood filtration. The glomerulus is a network of capillaries surrounded by a cuplike structure, the glomerular capsule (or Bowman’s capsule). As blood flows through the glomerulus, blood pressure pushes water and solutes from the capillaries into the capsule through a filtration membrane. This glomerular filtration begins the urine formation process.

$\bigstar$ Secretion

The Filtration Membrane Keeps Blood Cells and Large Proteins in the Bloodstream while keeping blood cells and large proteins in the bloodstream Inside the glomerulus, blood pressure pushes fluid from capillaries into the glomerular capsule through a specialized layer of cells. This layer, the filtration membrane, allows water and small solutes to pass but blocks blood cells and large proteins. Those components remain in the bloodstream. The filtrate (the fluid that has passed through the membrane) flows from the glomerular capsule further into the nephron.

$\bigstar$ Reabsorption

Reabsorption Moves Nutrients and Water Back into the Bloodstream. The glomerulus filters water and small solutes out of the bloodstream. The resulting filtrate contains waste, but also other substances the body needs: essential ions, glucose, amino acids, and smaller proteins. When the filtrate exits the glomerulus, it flows into a duct in the nephron called the renal tubule. As it moves, the needed substances and some water are reabsorbed through the tube wall into adjacent capillaries. This reabsorption of vital nutrients from the filtrate is the second step in urine creation.