Functioning Organisms - 05 The Excretory System
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The excretory system is responsible for processing and eliminating metabolic waste from the body. Carbon dioxide is removed through exhalation via the lungs. The kidneys filter blood in the nephrons, removing urea and salts to produce urine, which is stored in the bladder and then excreted. Other organs such as the skin, liver, and intestines also play roles in excretion, with the skin releasing wastes in sweat and the liver breaking down toxins and urea. Together, these organs comprise the excretory system and ensure harmful metabolic byproducts are continuously removed from the body.
Functioning Organisms - 05 The Excretory System
- 1. FUNCTIONING ORGANISMS. 05. Excretory system. Ian Anderson Saint Ignatius College Geelong
- 2. EXCRETORY SYSTEM. Responsible for Processing and elimination of metabolic wastes. CO2 is excreted through your lungs. Urea & salts are excreted by your kidneys and removed from your body as urine. Controls amount of water in our body. Source: http://www.cakechooser.com/
- 3. EXCRETORY SYSTEM. As our cells undergo their many metabolic processes, harmful wastes are continually being produced. Metabolic wastes include CO2, urea, salts, water, etc. These wastes must be collected and removed before they increase in concentration to poisonous levels. The process of removing these metabolic wastes is called excretion.
- 4. EXCRETORY SYSTEM. Faeces is waste from your digestive system, however it is not metabolic waste and therefore its removal is not excretion. Faeces is undigested food that your body has not been able to process. Removing digestive wastes is called egestion. Source: http://flickrhivemind.net/Tags/diarrhea/Timeline
- 5. EXCRETORY SYSTEM. The organs of excretion are the: Lungs. Skin. Liver. Kidneys.
- 6. EXCRETORY SYSTEM. The lungs. Releases CO2 into the air from the bloodstream. CO2 is a waste product of cellular respiration that occurs in all our cells. Our blood collects CO2 from our cells and transports it to our lungs where it diffuses into the alveoli and is then breathed out. Source: http://www.uic.edu/classes/bios/bios100/lecturesf04am/lect20.htm
- 7. EXCRETORY SYSTEM. The skin. Sweat is a mixture of three metabolic wastes. Water, salts & urea. Sweat has a cooling effect on your body (evaporative cooling). Source: http://www.youtube.com/watch?v=RJItaB8M24c
- 8. EXCRETORY SYSTEM. The liver. Has several functions (not all are involved with excretion). Breaks down protein waste products into urea. Detoxifies blood (e.g. alcohol). Breaks down old red blood cells. Stores glucose as glycogen. Produces bile. Source: http://11uexcretorysystem.wordpress.com/
- 9. EXCRETORY SYSTEM. The kidneys. The primary organ of the urinary system. Urinary system is made up of: Kidneys. Ureters. Bladder. Urethra. Source: Sharwood (2005)
- 10. EXCRETORY SYSTEM. The kidneys. Made of ~2.4 million tiny structures called nephrons. Each nephron is a filtering machine. Source: http://www.beltina.org/health-dictionary/nephron- function-kidney-definition.html
- 11. EXCRETORY SYSTEM. The nephron. Blood is pumped into kidneys and forced under pressure via specialised capillaries called a glomerulus into the Bowman’s capsule. Source: http://www.beltina.org/health-dictionary/nephron- function-kidney-definition.html
- 12. EXCRETORY SYSTEM. The nephron. The filtrate then travels through the proximal tubules and Loop of Henlé where wanted substances such as glucose, vitamins, minerals and water are reabsorbed into the bloodstream. The filtered waste (now called urine) then leaves the kidney and moves into ureter. Source: http://www.beltina.org/health-dictionary/nephron- function-kidney-definition.html
- 13. EXCRETORY SYSTEM. The kidneys. Once urine leaves the kidney it enters the ureter and travels to the bladder, where it is stored. Urine then travels through the urethra out of the body when your urinate. Source: Sharwood (2005)
- 14. BIBLIOGRAPHY. Sharwood, J. (Ed.). (2005). Science Edge 2. Melbourne: Thomson Learning.