Final answer:
Within the matrix of elastic connective tissue, there are primarily elastic fibers and collagen fibers. Elastic fibers provide flexibility due to their ability to stretch and recoil. Dense irregular connective tissue and loose (areolar) connective tissue are related types that include similar components but are different in density and structure.
Step-by-step explanation:
Types of Tissues in Elastic Connective Tissue
In elastic connective tissue, which is a type of dense connective tissue, the matrix contains primarily elastic fibers along with collagen fibers. These elastic fibers are made of a protein called elastin. Elastic fibers are known for their ability to stretch considerably and then recoil back to their original shape, providing significant flexibility to the tissues. Additionally, the matrix may include fibroblasts, which produce the fibers and ground substance, and some macrophages. Elastic tissues are typically found in areas that require elasticity, such as the walls of arteries and certain ligaments.
Dense irregular connective tissue, which is densely woven with elastic and collagen fibers, can be found in organ capsules and walls of arteries. In particular, the walls of the arteries have a high content of elastic fibers to allow them to withstand the pressure fluctuations resulting from heartbeats.
Loose connective tissue, or areolar tissue, also contains some of these components though they are not packed as densely as in dense connective tissue. Areolar tissue encompasses collagen fibers, which provide structure and support, and also houses blood vessels that nurture surrounding tissues.