urinavgång

Urinavgång, also known as urination or micturition, is the process by which urine is expelled from the body. This physiological function is essential for removing waste products and excess fluid from the bloodstream. The process involves the coordinated action of the urinary system, primarily the kidneys, ureters, bladder, and urethra.

The kidneys filter waste products, such as urea, from the blood and produce urine. This urine then travels down the ureters to the bladder, a muscular sac that stores it. When the bladder is sufficiently full, stretch receptors send signals to the brain, creating the sensation of needing to urinate.

The voluntary control over urination is managed by the brain and the nervous system. When the decision is made to urinate, the muscles of the bladder contract, and the sphincter muscles surrounding the urethra relax, allowing urine to flow out of the body through the urethra.

The frequency and volume of urination can vary significantly between individuals and can be influenced by factors such as fluid intake, diet, medications, and underlying health conditions. Involuntary loss of urine, known as incontinence, can occur due to various medical reasons and is a condition that can be managed with appropriate treatment.