<P> Enzymes are manufactured close to the hyphal tip . Some are packaged in vesicles associated with the Golgi and then delivered to the hyphal tip . The contents are released at the tip . Some enzymes are actively excreted through the plasma membrane, where they diffuse through or act in the cell wall . Note that the enzymes released from the hyphal tip require an aqueous environment for release and subsequent degradative activity . </P> <P> The molecules absorbed through the plasma membrane tend to be smaller than 5,000 Da, so only simple sugars, amino acids, fatty acids and other small molecules can be taken up following digestion . The molecules are taken up in solution . In some cases, the molecules are processed by enzymes located within the cell wall . For instance, sucrose inverters have been localized in walls of yeasts . Glucose appears to be the sugar preferred by most fungi . Uptake of other sugars is repressed when glucose is available . Similarly, ammonium, glutamine and asparagine regulate the uptake of nitrogen compounds, and cysteine of sulphur compounds . </P> <P> Joint intracellular and extracellular digestion In hydra and other cnidarians, the food is caught by the tentacles and ingested through the mouth into the single large digestive cavity, the gastrovascular cavity . Enzymes are secreted from the cells bordering this cavity and poured on the food for extracellular digestion . Small particles of the partially digested food are engulfed into the vacuoles of the digestive cells for intracellular digestion . Any undigested and un-absorbed food is finally thrown out of the mouth . </P> <P> Single - celled organisms as well as sponges digest their food intracellularly . Other multi-cellular organisms digest their food extracellularly, within a digestive cavity . In this case the digestive enzymes are released into a cavity that is continuous with the animal's external environment . In cnidarians and in flatworms such as planarians, the digestive cavity, called a gastrovascular cavity, has only one opening that serves as both mouth and anus . There is no specialization within this type of digestive system because every cell is exposed to all stages of food digestion . </P>

Where is most of the extracellular digestion performed in cnidarians
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