Final answer:
A signal transduction pathway is initiated in response to a stimulus, which ultimately leads to the opening or closing of ion channels in the cell's plasma membrane.
Step-by-step explanation:
In response to a stimulus, a signal transduction pathway is initiated, which ultimately leads to the opening or closing of ion channels in the cell's plasma membrane.
Signal transduction pathways are responsible for transmitting signals from the exterior of the cell to the interior, activating a series of events that eventually result in a cellular response. These pathways can be activated by various signaling molecules, such as hormones or neurotransmitters, which bind to specific receptors on the cell surface.
The opening or closing of ion channels is a crucial step in a signal transduction pathway as it allows ions to flow into or out of the cell, influencing its membrane potential and various cellular processes.