Excretory system
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Excretory system

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Excretory system Excretory system Presentation Transcript

  • The Excretory System
  • • Excretion is the process of eliminating waste matter from the body
  • • The excretory system removes excess, unnecessary materials from the body to prevent damage • The urinary system rids the body of wastes produced by the cells
  • • To maintain optimal health, fluid levels within the body must be balanced • The hypothalamus is a part of the brain that has many functions; one is that it monitors the amount of water in the blood
  • • When too much water is present, the hypothalamus releases a hormone that signals the kidneys to release urine • Urine is excess wastewater; it contains salt and other wastes not absorbed by the body –Excess amino acids are converted into a chemical called urea, which is excreted in urine
  • • The kidneys are the main organs of the urinary system. • The kidneys are two bean-shaped organs that filter waste out of the blood • Nephrons are the tiny filtering units in the kidneys
  • • Ureters are tubes that lead from each kidney to the bladder • The bladder is a muscular organ that holds urine until it exits the body • Urine is carried out of the body through a tube called the urethra
  • • Kidney stones cause blockage of the ureter or the urethra *Kidney stones can be caused by not drinking enough water.
  • • When a person’s kidneys fail, their blood must be filtered by a machine. • This process is called dialysis