Unformatted text preview: contraction pass over the cell body like wind blowing through ripe corn. . If paramecium encounters an obstacle, it reverses the ciliary beat and moves back. It then changes direction slightly and moves forward. It will do this repeatedly until it gets past the obstruction. This reaction also shows that paramecium is sensitive to stimuli (in this case, the stimulus of touch). contractile vacuole (about to empty)) contractile vacuole (filling) meganucleus (controls basic processes) micronucleus (controls reproduction) cilia anal pore cytostome (cell ‘mouth’) oral groove feeding current food vacuole Paramecium direction of movement power stroke recovery 1 Paramecium hits an obstacle 2 reverses its ciliary beat 3 turns slightly 4 moves forward again cytoplasm 60µ © D.G. Mackean...
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- Fall '11