section 3 (2) explain why the removal of wastes is essential for continued metabolic activity Flashcards

1
Q

What are some examples of wastes that need to be removed?

A
  • carbon dioxide
  • salts
  • excess water
  • nitrogenous wastes
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2
Q

Why must wastes be removed from the body?

A
  • can be toxic to cells

- inhibit enzyme function, hence interfering with normal metabolic activity and homeostasis

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3
Q

What are 3 examples of wastes and their impacts?

A
  • CO2; lowers blood pH as bicarbonate ions
  • Urea: can build up to toxic levels and poison cells
  • Excess mineral salts: effect cell osmotic pressure and hence metabolic efficiency
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4
Q

How are CO2, Urea and Excess mineral salts excreted respectively?

A
  • CO2; excreted by lungs
  • Urea: excreted by kidneys
  • Excess mineral salts: excreted by kidneys and sweat glands
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