Excretory System

• The excretory system rids the body of ____________ and other waste products we don't need in the body.

  Nitrogenous Wastes
• Why do nitrogenous metabolites and other waste products need to be removed from the body?

  To achieve homeostatis
• What are examples of cellular wastes?


  Heat, Water, Salt, CO2, Urea, Uric Acid, Ammonia
• What are the functions of kidney?

  Remove cellular waste from our blood, filter waste from blood.
• What happens when there is no excretion occuring?

  Poisonous waste build up in blood cells and tissues and leads to illnesses and death.
• What are the three forms of nitrogenous waste?

  Ammonia, Urea, Uric Acid
• What do the three forms of nitrogenous waste differ from?

  Toxicity and Energy Cost in Producing them
• What are the animals that excrete ammonia?

  Aquatic Animals, Bony Fishes
• What are the animals that excrete urea?

  Mammals, amphibians, sharks, some bony fishes.
• What organisms excrete uric acid?

  Birds, reptiles, insects, land snails.
• When an animal excrete nitrogenous wastes of ammonia, what do they need access from?

  Water
• What is common in animals that excrete ammonia?

  They are invertebrates
• Which is more toxic, urea or ammonia?

  Ammonia
• Which is less toxic, ammonia or urea?

  Urea
• Where is the urea produced?

  Liver
• What system carries the urea to the kidneys?

  Circulatory System
• The conversion of ammonia to urea is?

  Energetically expensive
• The excretion of urea requires __________ than ammonia.

  Less Water
• Excreting urea is ______ energetically expensive

  Less
• A relatively nontoxic nitrogenous waste

  Uric Acid
• A nitrogenous waste that does not dissolve readily in water

  Uric Acid
• Which is more energetically expensive, Urea or Uric Acid?

  Uric Acid
• Uric Acid is _____


  non-toxic
• Uric Acid does not readily ______ in water

  dissolve
• What is the animal excretory structure of Protozoa?

  Cell Membrane and Contractile Vacuole
• What is the cell membrane for?

  Diffusion
• What is the contractile vacuole?

  Excess Water
• What is the animal excretory structure of Flatworms?


  Flame Cells
• What is the scientific name of flatworms?

  Planaria
• What are the animal excretory structures of earthworm?

  Nephridia and Skin
• What is the animal excretory structure of a grasshopper?

  Malpighian Tubules, Tracheae
• What is the animal excretory system for crayfish?

  Kidneys and Gills
• What is the excretory system of snakes?

  Kidneys
• What are the four organs of excretory system?

  Lungs, Skin, Skin, Kidneys
• What are the waste products that lungs excrete?

  CO2 and H2O
• What are the waste products of skin?

  Sweat Glands
• What is the responsibility of liver?

  Detoxifies blood
• What does the liver excrete?

  Bile pigments
• What does the liver form?

  Urea
• Where is the urea stored?

  Gallbladder