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Phylum Mollusca (Taxonomic Divisions (Class Gastropoda (Subclass…

- - - - Open
        
        Transport medium flows through large open spaces but mixes with interstitial fluid
      - Closed
        
        Transport medium, stays within vessels (smallest are capillaries) and exchange with interstitial fluid occurs across capillary walls
      - Most mollusks have an open system
        Cephalopods have a Closed system
  - - - --Freshwater and terrestrial snails and slugs (pulmonates)
      - --Mantle cavity modified into internal lung with opening (pneumostome) to the outside
    - - Cephalopods rely exclusively on a pair of ctenidia for gas exchange---coupled with a closed circulatory system...Branchial hearts pump hemolymph into the ctenidia
  - - - Specialized regions of the alimentary canal allows for more efficient digestion of food and absorption of nutrients
      - The intestine is ciliated which is how food is moved through
      - Lifestyle and digestive tract varies greatly among mollusk classes
  - - - Long and winded tubes, where re-absorption occurs across is wall
        --The tubes are OPEN ON BOTH ENDS....
        ----Nephridiopore - waste exits into mantle cavity or environment
        ----Nephrostome - ciliated funnel that collects wastes from the coelom