churn in American English. churnverb [ I/T ] [ I ] The water was churning and the boat was rocking. [ M ] The fish churned up the water when we threw them some food. [ T ] fig. Seeing the car ahead flip over churned his stomach.
The nucleus controls everything that happens in the cell. This means that it controls the chemical reactions that take place in both and animal and plant cells. Some organelles in the cell have their own job like mitochondria control the respiratory (for example).
Both the cell membrane and the cell wall serve this function. All cells have a cell membrane, and certain cells (plant and bacterial) also have a cell wall. The cell membrane's main function is to regulate the movement of materials into and out of the cell. During plasmolysis, the cell membrane pulls away from the cell wall. 2  This does not happen in low salt concentration because of the rigid cell wall. 3  Plant cells maintain their normal size and shape in a low salt concentration solution.