| A | B |
|---|
| Pharnyx | Tubelike muscular organ that extends out of the mouth |
| Flame cells | Lined with cilia; sweeps water and excretory substances into tubules |
| Ganglion | Cell bodies that coordinates incoming and outgoing nerve signals |
| Regeneration | A process in which body parts that are missing can be regrown |
| Scolex | Has hooks and suckers that attach to the intestinal lining of a host |
| Hydrostatic skeleton | Fluid within a closed space that provides rigid support for muscles to work against |
| Trichinosis | Contracted by eating raw pork |
| Mantle | Membrane that surrounds the internal organs of mollusks |
| Radula | Used by mollusks to scrape food into their mouths |
| Gills | Respiratory structures of mollusks |
| Open circulatory system | Blood in pumped out of vessels into open spaces surrounding the body organs |
| Closed circulatory system | Blood is confined to vessels as it moves through the body |
| Nephridia | These structures get rid of metabolic wastes from cellular processes |
| Siphon | Tubular organ through which octopuses and squids eject water |
| Crop | Within an earthworm, food and soil are stored here |
| Gizzard | Muscular sac containing hard particles that help grind soil and food before they pass into the intestine |
| Setae | Anchor and earthworm during movement |
| Clitellum | Thickened band of segments that produce a cocoon from which young earthworms hatch |
| Turbellarians | Planarians |
| Trematodes | Flukes |
| Cestodes | Tapeworms |
| Trichinella worms | Larvae burrow into muscles and form cysts, which causes muscle pain |
| Hookworms | Infections from these worms are common in warm climates when people go barefoot on contaminated soil |
| Ascarid worms | Infection from these worms can result when unwashed vegetables are eaten |
| Pinworms | The most common nematode parasite in humans in the United States |
| Filarial worms | Cause the disease Elephantiasis |
| Gastropods | Stomach-footed mollusks |
| Bivalves | May seem inactive but are continuously filter feeding and carrying on all bodily functions |
| Cephalopods | Head-footed mollusks |
| Earthworms | Can eat its own mass in soil everyday |
| Marine annelids | Includes bristleworms and fanworms |
| Leeches | Saliva contains chemicals that act as an anesthetic |
