Excretion

• Carbon dioxide is excreted through the lungs
• Kidneys excrete urea and excess water and ions
• Label the diagram

  A) kidney

  B) ureter

  C) bladder

  D) urethra

  E) renal vein

  F) renal artery

  
• Label the diagram

  A) cortex

  B) medulla

  
• Label the diagram

  A) glomerulus

  B) bowman's capsule

  C) collecting duct

  D) tubule

  
• Where is urea formed?

  Liver
• What is urea made of?

  Excess amino acids
• What is deamination?

  The removal of the nitrogen containing part of amino acids to form urea
• What is the function of the glomerulus?

  Filtering out small molecules from the blood (water, urea, glucose and salts)
• What is the function of the kidney tubule?

  Reabsorbing molecules necessary for the body
• What molecules does the kidney tubule reabsorb back into the blood?

  All of the glucose, most of the water, some of the ions
• What is in urine?

  urea, excess water and excess ions
• What does the liver do in assimilation?

  Excess amino acids are converted into different proteins
• Excretion is important because urea is very toxic
• Increase in body temperature: Decreases urine volume, increases concentration

  Increase in exercise: Decreases volume, Increases concentration