The video tutorial explains the IP3 pathway, detailing the roles of first and second messengers in cellular responses. It describes how extracellular ligands bind to G protein-coupled receptors, leading to the activation of phospholipase C, which cleaves PIP2 into IP3 and DAG. IP3 facilitates calcium release from the endoplasmic reticulum, while DAG and calcium activate protein kinase C, resulting in phosphorylation of target proteins and a cellular response.

Explain the role of protein kinase C in the cellular response.

What are the second messengers involved in the IP3 pathway?

Summarize the overall process of the IP3 calcium pathway.