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    Gaseous exchange in earthworm & polychaetes

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    1. How is gas exchange accomplished by earthworms?
    2. What is the function of the nephridia of the molluscs?
    4. How does gas exchange take place in marine polychaetes?
    5. How does the body organization of crustaceans differ from the body organization of flightless insects?
    6. Name and list four characteristics of arthropods that have enabled them to be extremely successful, and describe the adaptive value of each characteristic.

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    Solution Preview

    1. How is gas exchange accomplished by earthworms?
    Respiration in Earthworm takes place by diffusion of gases through the general body surface. The gaseous exchange, i.e., intake of O2 and giving out CO2, takes place between the blood capillaries of the outer epidermis and the surface film of moisture contributed by secreted mucus, excreted wastes and coelomic fluid. Haemoglobin dissolved in the plasma of blood acts as a respiratory pigment, transporting O2 to the body tissues.
    2. What is the function of the nephridia of the molluscs?
    Nephridia is an excretory organ of molluscs that remove metabolic waste ammonia from body fluids.
    3. How does gas ...

    Solution Summary

    Gaseous exchange in earthworm occurs through the body surface. Circulatry system is accordingly adapted to receive the gases through the body surface. However, in polychaetes parapodia are used for movement and it act as the annelid's primary respiratory surfaces. The rich blood vessels in the parapodia function as gills providing surface for the gaseous exchange