What organelle cell respond to stimuli?

The organelle primarily responsible for responding to stimuli in a cell is the plasma membrane. It contains various receptors that detect environmental signals, such as hormones and neurotransmitters, allowing the cell to respond appropriately. Additionally, the endoplasmic reticulum and Golgi apparatus play roles in processing and transmitting signals within the cell. Together, these structures enable cells to adapt and react to changes in their environment.