Excretion

• undigested food becomes solid waste
• it leaves the anus of the animal
• Terrestrial arthropods remove nitrogen-containing wastes by...
  --->using a set of Malpighian tubules
  --->found in the body sinuses
  --->remove waste from blood, concentrate them, and then add undigested food allowing it to leave through anus
  --->may have small excretory glands at bases of legs
• Aquatic arthropods remove nitrogen-containing wastes by...
  --->through a pair of green glands found by base of antennae
  --->eliminated through a pair of opening on the head