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7 Cards in this Set
- Front
- Back
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Phylum |
the phylum Mollusca. |
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Body Characteristics |
-Mollusks range in size from almostmicroscopic snails to giant squids, which can grow to be 21 m long. - a soft internal body, a digestive tract with two openings, a muscular foot, and amantle. - The mantle : is a membrane that surrounds theinternal organs of the mollusk. - Other mollusks, includingslugs and squids, are adapted to life without a hard outer covering. |
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Ceolom |
Mollusks are coelomate animals |
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Habitat |
Many are marine, some live in freshwater, and otherslive in moist land environments. |
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Symmetry |
bilateral symmetry |
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Body systems |
-digestive system: Mollusks have complete guts with digestive glands, stomachs, andintestines -respiratory system: mollusks have respiratory structures called gills. rich supply of blood for the transport of oxygen to theblood and for the removal of carbon dioxide from the blood. -circulatory system: they have an open circulatorysystem, in which the blood is pumped out of vessels into open spaces and some of them have an closed circulatory system, blood is confined to vesselsas it moves through the body. nervous system;. -excretion: mollusks get rid of metabolic wastes from cellularprocesses through structures called nephridia,After nephridia filter the blood, waste is passedout through the mantle cavity. Nephridia are an evolutionary adapta-tion enabling mollusks to efficiently maintain homeostasis in theirbody fluids. -nervous system :Mollusks have nervous systems that coordinate their movements and behavior. |
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Feeding |
- Many mollusks use a rasping structurecalled a radula to scrape food into their mouths. - a radula : is a tonguelike organ with rows of teeth -Herbivorous mollusks use their radulas toscrape algae off rocks. - Carnivorous mollusks use their radulas to drillinto other mollusks and feed on their internal body parts -Other mollusks, such asclams, are filter feeders and do not have radulas. |
