Here's a breakdown:

* Cell membrane: The outermost layer of a cell, separating the cell's interior from the external environment. It's a thin, flexible barrier that controls what enters and exits the cell.

* Extracellular matrix (ECM): A complex network of molecules that surrounds and supports cells. It's composed of proteins (like collagen and elastin), carbohydrates, and other molecules.

The ECM plays several important roles:

* Structural support: Provides a framework for cells to attach to and organize into tissues.

* Regulation of cell behavior: Influences cell shape, migration, proliferation, and differentiation.

* Tissue repair and regeneration: Provides a scaffold for new tissue growth.

Let me know if you'd like more details about the ECM or any of its components!