What are the two different proteins present in the extracellular matrix (ECM)?

The correct answer highlights two fundamental categories of proteins found in the extracellular matrix (ECM): structural proteins and adhesive proteins. Structural proteins, such as collagen and elastin, provide support and strength to tissues, contributing to the overall architecture of the ECM. They are critical for maintaining the integrity and mechanical properties of tissues. On the other hand, adhesive proteins, such as fibronectin and laminin, facilitate cell attachment to the ECM and play a vital role in communication between cells and their surrounding environment. This interaction is crucial for processes like tissue development, stability, and repair.

The other options do not accurately represent the components of the ECM. Tissue repair and secretion refer more to processes and functions rather than specific types of proteins. Fibrous and globular can categorize proteins based on their structure, but they do not specifically address the functions of these proteins in the context of the ECM. Polysaccharides, while important components of the ECM, are not proteins; they are carbohydrates that play a role in providing hydration and facilitating cell signaling but do not fall into the categories of structural or adhesive proteins.