What does it mean to say that a signal is transduced?

Question

Quizplus · Accepted Answer

Transduction refers to the conversion of a signal from one form to another. In the context of cellular signaling, this refers to the conversion of an extracellular signal (such as a hormone or neurotransmitter) into an intracellular signal (such as activation of a protein kinase cascade). This process often involves changes in the physical form of the signal as it passes through the cell membrane, such as receptor binding or membrane depolarization. However, it does not necessarily involve amplification or phosphorylation.

What Does It Mean to Say That a Signal Is