3 concepts
Contractile Vacuoles in Microorganisms
Contractile vacuoles absorb excess water and wastes from a microorganism's cell and excrete them into the environment by contracting.
Flame Cells of Planaria and Nephridia of Worms
Flame cells and nephridia remove the waste from bodies through filtration in a manner similar to a kidney.
Malpighian Tubules of Insects
Malpighian tubules remove wastes from insects by producing urine and solid nitrogenous waste, which are then excreted from the body.