What controls the flow of urine?
Controlling the outflow of urine are two valves, or sphincters, located in the bladder neck and earliest portion of the urethra. The bladder neck sphincter is under involuntary (autonomic) control while the urethral sphincter has both voluntary and involuntary components.
How does the mechanism for voiding urine start?
calyx. The mechanism for voiding urine begins with the voluntary relaxation of the: internal sphincter muscle of the bladder.
What is the main component of urine?
It consists of water, urea (from amino acid metabolism), inorganic salts, creatinine, ammonia, and pigmented products of blood breakdown, one of which (urochrome) gives urine its typically yellowish colour.
Why can we control urination?
When you urinate, the bladder wall muscle squeezes to force urine out of the bladder. As this happens, the sphincter muscle relaxes to allow the urine to pass through. All of these systems must work together to control urination: Your bladder muscles and other parts of your urinary tract.
What is the pH of urine?
The normal values range from pH 4.6 to 8.0. The examples above are common measurements for results of these tests. Normal value ranges may vary slightly among different laboratories. Some labs use different measurements or test different samples.
What happens if urine is controlled?
When you hold your pee for 10 hours or more, you may develop urinary retention, meaning the muscles in your bladder can’t relax and let you relieve yourself, even when you want to. In very rare cases, holding your pee can cause your bladder to burst.
What are 3 functions of the urinary system?
Organs of the Renal / Urinary System They remove wastes, control the body’s fluid balance, and keep the right levels of electrolytes.
What is the bladder control mechanism for urination?
Bladder Control Mechanism for Urination and Micturition Reflex. The bladder stores urine until the accumulated urine stretches the bladder to a significant degree to trigger the reflexes that will result in urination. With the relaxation of the external urethral sphincter, increase in abdominal pressure and contraction of the detrusor muscle,…
What is the mechanism of urine formation?
The mechanism of urine formation involves the following steps: Glomerular filtration occurs in the glomerulus where blood is filtered. This process occurs across the three layers- epithelium of Bowman’s capsule, endothelium of glomerular blood vessels, and a membrane between these two layers.
How does urination occur in the body?
How does urination occur? To urinate, your brain signals the sphincters to relax. Then it signals the muscular bladder wall to tighten, squeezing urine through the urethra and out of your bladder.
What is the function of the brain in urination?
To urinate, the brain signals the muscular bladder wall to tighten, squeezing urine out of the bladder. At the same time, the brain signals the sphincters to relax. As the sphincters relax, urine exits the bladder through the urethra.