vizeletürítéssel

Vizeletürítés, also known as micturition or urination, is the process by which urine is expelled from the body. This complex physiological function involves the coordinated action of the urinary bladder, the urethra, and a network of muscles and nerves.

The urinary bladder serves as a reservoir for urine, which is produced by the kidneys. As the bladder fills, stretch receptors in its walls send signals to the brain, triggering the sensation of needing to urinate. This sensation is initially voluntary, allowing individuals to choose an appropriate time and place to void.

When the decision to urinate is made, the detrusor muscle, which forms the wall of the bladder, contracts. Simultaneously, the internal and external urethral sphincters, muscles that control the flow of urine from the bladder, relax. The external urethral sphincter is under voluntary control, allowing for conscious initiation and cessation of urination.

The expulsion of urine through the urethra is facilitated by the pressure generated by the contracting bladder muscles and the relaxation of the sphincters. Once the bladder is empty, the sphincters contract, and the detrusor muscle relaxes, completing the cycle of vizeletürítés. Disruptions to any part of this process can lead to various urinary disorders.