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Urinary System Essay

1888 words - 8 pages

The urinary system has many different organs in order for it to work as a whole. Each organ does different functions. The urinary system consists of the two kidneys, the two ureters, the bladder, the two sphincter muscles, the nerves in the bladder, and the urethra. After your body takes what it needs from the food you eat waste products are then left behind in the blood. The urinary system works with the lungs, skin, and intestines to keep the chemicals and water in your body balanced. The urinary system removes urea from your body. Urea is made when the foods you eat that are high in protein are broken down in the body. Urea is then carried into the bloodstream to the kidneys by the ...view middle of the document...

The blood enters the kidney through the bowmans capsule under pressure. This just surrounds the tuft of capillaries which is the glomerulus. The liquid just flows through the glomerulus under pressure. The pressure pushes the liquid out and keeps in the larger cells. This is filtration, because the glomerulus is taking the nutrients in and getting rid of the waste. After the filtering process has finished in that area it then drains into the proximal tubules. The proximal tubules reabsorb the glucose, and amino acids. Still traveling along it ends up in the loop of henle where more water absorption happens. After going through the loop of henle it makes a hairpin turn and goes to the distal convoluted tubule. A lot of sodium is reclaimed here. Moving on to the collecting duct which leads to the pelvis of the kidney. From here it leads the urine to the bladder, and out into the outside world.

Next we move on to the ureters. These are located in the pelvis of the body. These arent organs, but they are an essential part of the urinary system. These are the tubes that carry the urine from the kidneys to the bladder. There are two of them because there is one for each kidney. The one leading from the right is slightly shorter than the one leading from the left. They are known as the pipelines to the bladder. They are about 8 to 10 cm long.They are constantly contracting and relaxing, which is referred to as peristalsis, to force urine downward. The ureters act as a valve to prevent the back flow of urine into the kidney. If urine is left to sit there in the kidneys or the ureters, then this can result in a kidney infection. The ureters allow small amounts of urine into the bladder every 10 to 15 seconds. The area where the ureters enter the bladder is called the trigone. They get the urine to put into the bladder through the collecting duct. The ureters have thick walls, and theyre very narrow. It is comprised of three coats of tissue: mucosal, fibrous, and muscular layers. The mucous coat is smooth, and a bit slippery. Each ureter is cylindrical in shape. It is located near the lower end of the renal pelvis. After the ureters receive the urine from the collecting duct, they contract and the urine then releases into the bladder.

The urinary bladder is a hollow, muscular organ that stores urine. It is shaped like a balloon. It is located behind the pubic bone, in the lower abdomen, and is protected by the pelvis. The bladder is held in place by the ligaments that connect it to the pelvis. The bladder is connected to the urethra, and the opening for the urethra from the bladder is called the bladder neck. The muscles in the bladder neck are called sphincters. The sphincters tighten around the urethra to prevent urine from leaking. When the volume of urine in the bladder reaches about 250cc the brain sends impulses to the internal sphincter causing it to relax. This causes the muscles to push downward, and release the urine. As the bladder...

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