Which tissue is correctly paired with its primary cell type?

In a multicellular organism, every tissue is made up of specialized cell types that aid in carrying out a specific function. When a tissue is paired with its primary cell type, it means those cells are the key contributors to the structure and activity of that tissue.

For instance, epithelial cells make up epithelial tissue. The tissues are responsible for protective coverings and lining the body and major organ systems. Similarly, endothelial cells make up the endothelium that lines blood vessels, lymphatic vessels, and smooth muscle of the heart. It forms the largest system in the body.

Muscle tissue contains muscle cells (myocytes) that contract to move, and keratinocytes form the outermost skin. Nervous tissues are made up of neurons, which are specialized for sending signals from the brain to the other body parts.  

Connective tissues have their own specialized cell types as well. Fibroblasts are the main cells in forming connective tissue. Fibroblast aids in producing fibers and matrices that support surrounding structures. In cartilage, the primary cells are chondrocytes, whereas osteocytes are the mature cells found in bone. Blood is composed of distinct cell types, including red blood cells (RBCs), which play a major role in transportation of the oxygen throughout the body, and white blood cells (WBCs), which are responsible for the defense mechanism. Understanding the specialized cells and tissues is crucial for researchers to understand how organs function appropriately, what dysfunction causes the diseased state, how injuries heal, development of targeted therapy, regenerative medicine, etc.