responsible*for*waste* removal*and*excreon(...theliver: •...

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The Excretory System Responsible for waste removal and excre%on

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Page 1: Responsible*for*waste* removal*and*excreon(...TheLiver: • Converts*toxic*ammoniato*less*harmful*urea ,*which*is*released*into*our* bloodstream*for*filtraon*by*our*kidneys* *2*NH3*(aq)*+1*CO2*(g)*

The  Excretory  System

Responsible  for  waste  removal  and  excre%on  

Page 2: Responsible*for*waste* removal*and*excreon(...TheLiver: • Converts*toxic*ammoniato*less*harmful*urea ,*which*is*released*into*our* bloodstream*for*filtraon*by*our*kidneys* *2*NH3*(aq)*+1*CO2*(g)*

Liver  &  Kidneys: The  Kidneys  

•  The  main  excretory  system  organ  (Filtra%on)  

Page 3: Responsible*for*waste* removal*and*excreon(...TheLiver: • Converts*toxic*ammoniato*less*harmful*urea ,*which*is*released*into*our* bloodstream*for*filtraon*by*our*kidneys* *2*NH3*(aq)*+1*CO2*(g)*

The  Liver:

• Converts  toxic  ammonia  to  less  harmful  urea,  which  is  released  into  our  bloodstream  for  filtra:on  by  our  kidneys  

 2  NH3  (aq)  +  1  CO2  (g)      1  (NH2)2CO  (aq)  +  1  H2O  (l)  (2  molecules  of  ammonia  +  1  molecule  of  carbon  dioxide  produces  1  molecule  of  urea  and  1  molecule  of  water)  

Page 4: Responsible*for*waste* removal*and*excreon(...TheLiver: • Converts*toxic*ammoniato*less*harmful*urea ,*which*is*released*into*our* bloodstream*for*filtraon*by*our*kidneys* *2*NH3*(aq)*+1*CO2*(g)*

The  Kidney:

•  Every  drop  of  your  blood  is  filtered  300  :mes  per  day  

•  You  produce  about  1.5  L  of  urine  per  day    

Page 5: Responsible*for*waste* removal*and*excreon(...TheLiver: • Converts*toxic*ammoniato*less*harmful*urea ,*which*is*released*into*our* bloodstream*for*filtraon*by*our*kidneys* *2*NH3*(aq)*+1*CO2*(g)*

The  Kidney:

Renal  Arteries  •  Carry  unfiltered,  oxygenated  blood  to  the  kidneys  

•  Branch  into  smaller  and  smaller  blood  vessels  down  to  capillaries  that  supply  blood  to  the  nephrons  

Renal  Veins  •  Carry  filtered,  deoxygenated  blood  away  from  the  kidneys  

 

Page 6: Responsible*for*waste* removal*and*excreon(...TheLiver: • Converts*toxic*ammoniato*less*harmful*urea ,*which*is*released*into*our* bloodstream*for*filtraon*by*our*kidneys* *2*NH3*(aq)*+1*CO2*(g)*

The  Kidney:

Nephrons  •  Remove  waste  from  the  blood    •  Produce  urine  •  Microscopic  •  Found  in  the  Medulla  •  We  have  millions  of  them      

Page 7: Responsible*for*waste* removal*and*excreon(...TheLiver: • Converts*toxic*ammoniato*less*harmful*urea ,*which*is*released*into*our* bloodstream*for*filtraon*by*our*kidneys* *2*NH3*(aq)*+1*CO2*(g)*

Other  Parts: Ureters  •  Long  tubes  from  kidneys  to  bladder  •  Carry  urine  out  of  kidneys    Bladder  •  Sac  covered  in  muscle  :ssue  •  Holds  urine  

Urethra  •  Tube  that  carries  urine  out  of  our  body  

Page 8: Responsible*for*waste* removal*and*excreon(...TheLiver: • Converts*toxic*ammoniato*less*harmful*urea ,*which*is*released*into*our* bloodstream*for*filtraon*by*our*kidneys* *2*NH3*(aq)*+1*CO2*(g)*

Our  Skin:

Sweat  Glands  • We  have  thousands  of  them  • Help  cool  our  body  when  we  exercise  • Help  remove  excess  salt  (uric  acid)  from  our  body  

Page 9: Responsible*for*waste* removal*and*excreon(...TheLiver: • Converts*toxic*ammoniato*less*harmful*urea ,*which*is*released*into*our* bloodstream*for*filtraon*by*our*kidneys* *2*NH3*(aq)*+1*CO2*(g)*

Dialysis: •  The  filtra:on  of  blood  through  a  

semipermeable  membrane  

•  Removes  waste  components  from  the  blood  using  diffusion  

•  Necessary  if  someone  has  kidney  damage  or  malfunc:on  

•  Life  saving  technology