Excretions Flashcards

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1
Q

What is excretion in a short sentence?

A

The removal of metabolic wastes from the body

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2
Q

What are the diffrent excretory organs?

A
  • Lungs
  • Kidneys and bladder
  • Liver and intestines
  • skin
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3
Q

What does the excretory organs excrete?

A
  • lungs excrete Co2, water vapour and heat
  • The kidneys excrete urine
  • The liver excretes urea and bile pigments
  • The skin excretes sweat via the sweat glands
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4
Q

What does urine consist of?

A
  • excess water
  • mineral salts
  • nitrogenous watse products, namely urea, uric acid and creatinine
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5
Q

What does sweat consist of?

A
  • excess water
  • salts
  • small amount of urea
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6
Q

What is the origin of metabolic waste products?

A
  • Co2 is formed as a product of cellular respiration
  • Excess water is formed as a product of cellular respiration, as well as from the intake of fluids and food
  • Urea is formed in the liver ffrom deamination of excess amino acids
  • Uric acid is the end product of metabolism of nucleic acids
  • Creatinine is formed from creatinine phosphate in the cells
  • Bile pigments are formed in the liver during the breakdown of haemoglobin.
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