1) Name this excretory organ. a) skin b) lung c) kidney d) liver e) colon 2) Which is the main excretory organ? a) lung b) skin c) colon d) kidneys e) liver 3) Which below is NOT an accessory excretory organ? a) lungs b) skin c) kidneys d) colon e) liver 4) Name this accessory excretory organ. a) liver b) lung c) skin d) colon 5) Which two excretory products are released from cellular respiration? a) water and urea b) carbon dioxide and bile pigments c) ammonia and uric acid d) carbon dioxide and water 6) Metabolic water is eliminated from which organs? a) liver, skin and kidneys b) skin, kidneys and lungs c) skin and kidneys only d) colon, skin, kidneys and lungs 7) Carbon dioxide is excreted through the? a) skin b) lungs c) kidneys d) liver 8) Urea, a harmful nitrogenous waste product made by cells are excreted through the a) skin b) lung c) kidneys d) kidneys and skin 9) Which two substances are produced by the breakdown of haemoglobin in the liver? a) bile pigment and ammonia b) uric acid and ammonia c) urochrome and urea d) bile pigment and urochrome 10) All of the following are roles of the excretory system except a) It regulates water balance in cells, tissues and blood plasma. b) It regulates body temperature. c) It regulates mineral salts in blood. d) It regulates blood pH e) It regulates ions. 11) Acidosis is a condition which is caused by the accumulation of excess ____________________ in the blood. a) carbon dioxide b) ammonia c) urea d) uric acid e) bile pigments 12) Gout is a condition which is caused by the build up of ____________ in the liver. a) ammonia b) uric acid c) urea d) bile pigments 13) The large intestine or colon serves as an excretory organ by removing excess a) mineral salts only b) mineral salts and water only c) mineral salts, water and bile pigments d) ammonia

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