细胞内消化—蕈细胞的原生动物和多细胞海绵动物的消化方式 Oral groove ue了 Intmceltler timesten in却 nme, P apone ta.epo that naps.uw wu! ood narcs Endocytose Doop aD回po( er Chowry F (formation ot 知包 food vacuole ouncing t taws w re Magela The coenocyte Anal pone onour me ood b phapocynous and rtraesur syas wuch w wn ewes tood to cimaT Figure 37.5 Intracellular digestion in Paramecium, Paramecium has a specialized feeding structure called the oral groove, which leads to the cells"mouth"(cytostome ilia that line the groove draw water and suspended food particles toward the mouth, where the food is packaged by endocytosis into a food vacuole that functions as a miniature digestive compartment. Cytoplasmic streaming carries food vacuoles around the cell, while hydrolytic enzymes are secreted into the vacuoles, As molecules in the food are digested, the nutrients(sugars, amino acid and other small molecules) are transported across the membrane of the vacuole into the cytoplasm. Later, the vacuole fuses with an anal pore, a specialized region of the plasma membrane where undigested material can be liminated by exocytosis细胞内消化——单细胞的原生动物和多细胞海绵动物的消化方式 ：