Urinary system presen.09

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SUMMER 2010

BIO - 120

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Urinary system presen.09

  1. 1. URINARY SYSTEM<br />by<br />Beatriz Bellini<br />
  2. 2. FUNCTION<br />The urinary system, also called GU genitourinary system, is responsible for maintaining a stable internal environment for the body. It main function is to filter and remove waste products from the blood. Resulting in the production and excretion of urine from the body.<br /><ul><li> removes waste products
  3. 3. adjust water
  4. 4. adjust electrolyte levels
  5. 5. maintain the correct Ph level</li></li></ul><li>ORGANS<br /> KIDNEYSFilters blood and produces urine<br />URETERSTransport urine to the bladder<br />URETHRATransports urine to exterior<br />URINARY BLADDERStores urine <br />
  6. 6. THE URINARY SYSTEM<br /> Urine needs to be eliminated otherwise quickly become toxic to our organism, resulting in uremia.<br /> The filtration of wastes from the blood takes place in the nephrons.<br /> Millions of neuphrons make up each of out Kidneys, where the urine<br /> Body Metabolic Process Production of waste product. (urine)<br />Its is one of the hardest working system of the body.<br />
  7. 7. Each kidney drains urine and transports it to the urinary bladder. Then, urine moves from the bladder down the urethra to the outside of the body.<br />
  8. 8. KIDNEYS<br />The two kidneys are located in the lumbar region of the back<br />above the waist on either side of the vertebral column and in form of a bean shape.<br />
  9. 9. Hilum is located at the center of the kidneys, where the renal artery enters and the renal vein leaves the kidney.<br />The renal artery delivers the blood that is full of waste products to the kidney.<br />The renal vein returns the clean blood to our general circulation.<br />
  10. 10. Inside of the kidney<br />The outer portion is called cortex and the inner area is called medulla.<br /> Nephron is the functional unit of the kidney.<br /> Each nephron consist of the renal corpuscle (blood filtering portion) and the renal tubule. <br /> The reabsorption and secretion stages of urine production occur within the renal tubule.<br />
  11. 11. Water and substances removed from bloodstream in the renal corpuscle flow into the renal tubules to finish the urine production process.<br />TUBULE IS DIVIDED IN 4 SECTIONS:<br /> proximal convoluted tubule<br /> loop of Henle (nephron loop) <br /> distal convoluted tubule<br /> collecting tubule<br />
  12. 12. URETERS<br /> The ureters are narrow tubes that lead from the kidneys to the bladder.<br />Urine enters the ureter after it drains out of the renal pelvis.<br />
  13. 13. URINARY BLADDER<br />It is considered an elastic muscular sac that lies in the base of the pelvis just behind the pubic symphysis.<br />Composed of three layers of smooth muscle tissue lined with mucous membrane containing rugae, folds that allow it to stretch.<br /> The bladder receives the urine directly from the ureters, stores it and excretes it in form of urine through the urethra. <br />Voluntary muscle action controls the external sphincter, which opens on demand to allow the intentional emptying of the bladder.<br />Involuntary muscle action causes the bladder to contract and the internal sphincter to relax.<br />
  14. 14. URETHRA<br /> It is a tubular canal that carries the flow of urine from the bladder to the outside of the body.Urinary meatus is the external opening which urine passes out of the body.<br />The urethra is 1 ½ inches long in the female and 8 inches long in the male. The male urethra has two functions, such as an outlet for urine and the passage-way for semen to leave the body.<br />
  15. 15. ROLE OF KIDNEYS - HOMEOTASIS<br />The kidneys are responsible for homeostasis or balance in your body.<br />Maintain the body proper balance of water, chemicals, electrolytes and maintain the correct pH range with the body. <br /> If the body is low in water, the kidneys conserve it. If there is excesses of water in the body, the body will excrete it. <br />
  16. 16. STAGES OF URINE PRODUCTION<br />All wastes and unnecessary substances are removed from the bloodstream by the nephrons. However, urine is the final product of this entire process of waste elimination.<br /> There are three stages of urine production:<br /> Filtration – The first stage is the filtering particles in the renal corpuscle.<br /> Reabsorption – After filtration, the filtrate passes through the four sections of the tubule. Most of the water, electrolytes and nutrients are reabsorbed.<br /> Secretion – The final stage of urine production occurs when the special cells of the renal tubules secrete ammonia, uric acid, and other waste substances directly in to the renal tubule.<br />
  17. 17. URINE is a normally straw colored to clear and sterile<br />Adults bladder can hold 250 mL of urine.<br />COMPOSITION OF URINE:<br />
  18. 18. URINE COLOR CHART<br />I am hydrated?<br />

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