Is urine continuously formed by the kidney and is routed down ureters to bladder mechanisms of peristalsis a storage organ called bladder?

No, urine is not continuously formed by the kidney and routed down the ureters to the bladder. The process of urine formation and elimination is a complex physiological process that involves several stages and organs. Here's a brief overview:

1. Filtration:

- The kidneys continuously filter waste products, excess water, and electrolytes from the bloodstream to form a filtrate called urine.

- This filtration process occurs in the microscopic filtering units of the kidneys called nephrons.

2. Reabsorption:

- As the filtrate moves through the nephrons, essential substances, such as water, glucose, amino acids, and other vital molecules, are reabsorbed back into the bloodstream.

3. Secretion:

- In addition to reabsorption, the nephrons can also actively secrete certain substances, such as drugs, toxins, and excess ions, into the filtrate, further modifying its composition.

4. Concentration:

- The remaining filtrate, which is now more concentrated, moves into the collecting ducts of the kidneys.

- In the collecting ducts, further water reabsorption occurs, and the urine becomes more concentrated, depending on the body's hydration status and other regulatory mechanisms.

5. Storage and Elimination:

- The concentrated urine flows through the ureters and into the urinary bladder, which acts as a storage organ.

- When the bladder reaches a certain capacity, stretch receptors signal the brain, triggering the urge to urinate.

- During urination, the bladder contracts while the sphincter muscles relax, allowing the urine to be expelled from the body through the urethra.

Therefore, urine production and elimination are not continuous processes but rather involve multiple stages of filtration, reabsorption, secretion, concentration, and storage before the urine is eventually eliminated from the body.