食物泡是原生动物把食物纳入细胞内形成的临时细胞器,食物泡形成后在细胞质中沿一定路线运行流动,并与初级溶酶体结合形成次级溶酶体(食物泡),对食物进行消化并吸收营养物质。食物泡中的食物残渣最后通过胞肛排出体外。从食物泡的产生到消失,有泡内液体p H的降低(p H 3~4)和再上升(p H约8)的变化。在观察草履虫实验中一般采用中性红(变色范围6.4~8.0,由红变黄)乙醇染液来观察食物泡的 Food bubble is a protozoan food into the cells to form a temporary organelles, the formation of food bubbles in the cytoplasm along a certain route of operation and flow, and primary lysosomes to form secondary lysosomes (food bubbles), the food digestion And absorb nutrients. The food residue in the food bubble finally excreted through the anus. From the onset to the disappearance of the food bubble, there was a change in the pH (p H 3 ~ 4) and reascending (p H about 8) of the liquid in the bubble. Paramecium in the observation of the experiment generally used neutral red (color range 6.4 ~ 8.0, from red to yellow) ethanol dye to observe the food bubble