The avoidance reaction is the term used in the description of the paramecium movement. This helps the cell avoid obstacles and causes other objects to bounce off the cell's outer membrane. Paramecium does this by reversing the direction in which the cilia are beating. This causes termination, spinning or reversal, after which the paramecium point continues to swim forward. If multiple avoidance reactions follow one another, it is possible for the paramecium to swim backwards, though not as smoothly as forwards.
The avoidance reaction occurs when the cell is obstructed, giving anterior mechanical stimulus: - The cell will then reverse. - It will stop and spin. - Now facing the new direction, the cell will move in that direction.
This process will continue until the cell is able to negotiate the way around the obstruction.
The movement of Paramecium cells is caused by the control of calcium ions inside the cell and the membrane potential. The simplest explanation for the avoidance reaction is that the membrane potential controls the entry of calcium ions, which regulates the pulse frequency and cilia angle on the cell surface.
Video Avoidance reaction
References
Source of the article : Wikipedia
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