Excretion Systems

Review Questions

Active transport of K+ in Malpighian tubules ensures that:

  1. water follows K+ to make urine
  2. osmotic balance is maintained between waste matter and bodily fluids
  3. both a and b
  4. neither a nor b

Hint:

C

Contractile vacuoles in microorganisms:

  1. exclusively perform an excretory function
  2. can perform many functions, one of which is excretion of metabolic wastes
  3. originate from the cell membrane
  4. both b and c

Hint:

D

Flame cells are primitive excretory organs found in ________.

  1. arthropods
  2. annelids
  3. mammals
  4. flatworms

Hint:

D