Learn how signals are relayed inside a cell starting from the cell membrane receptor. The chains of molecules that relay intracellular signals are known as intracellular signal transduction …

In order to detect a signal (that is, to be a target cell), a neighbor cell must have the right receptor for that signal. When a signaling molecule binds to its receptor, it alters the shape or activity of …

If you’re nervous before a test or competition, your adrenal gland is likely to be pumping out epinephrine. When epinephrine binds to its receptor on a muscle cell (a type of G protein …

Explore how alterations in signal transduction pathways affect cellular communication. Understand the role of G protein-coupled receptors in initiating responses.

Learn about the cell cycle and its role in growth, development, and reproduction through free resources on Khan Academy.

Now that we actually know the steps to this let's talk about an example. A very common example of GPCR function in our cell actually involves epinephrine or adrenaline.

Just as a journey of a thousand miles begins with a single step, so a complex signaling pathway inside of a cell begins with a single key event – the binding of a signaling molecule, or ligand, …

B Signal transduction pathways that are activated by multiple types of ligands C Signal transduction pathways that are inactive only if ligand-to-receptor binding does not occur D …

Explore cell communication and the cell cycle in AP Biology with videos, articles, and practice questions on Khan Academy.

Test your knowledge of signal transduction!