For example, some cells in a developing embryo migrate along specific pathways by matching the orientation of their microfilaments to the "grain" of fibers in the ECM.
[1] Bone is a form of connective tissue found in the body, composed largely of hardened hydroxyapatite-containing collagen.
Bone matrix allows mineral salts such as calcium to be stored and provides protection for internal organs and support for locomotion.
Cartilage is another form of connective tissue found in the body, providing a smooth surface for joints and a mechanism for growth of bones during development.
In the mitochondrion, the matrix contains soluble enzymes that catalyze the oxidation of pyruvate and other small organic molecules.
For instance, a Petri dish of agar may be the matrix for culturing a sample swabbed from a patient's throat.