Final answer:
Connective tissue proper is characterized by its gel-like ground substance and protein fibers in a matrix, including both loosely organized fibers in loose connective tissue and densely packed fibers in dense connective tissue, serving various functions in the body.
Step-by-step explanation:
Connective tissue proper has gel-like ground substance, and protein fibers in a matrix. The ground substance in connective tissue is a key component of the extracellular matrix, containing various proteins and glycosaminoglycans which contribute to its viscous, gel-like consistency. Connective tissue proper encompasses both loose connective tissue and dense connective tissue. Loose connective tissue includes structures such as areolar, adipose, and reticular tissues, characterized by loosely organized fibers and varied cell types embedded in the ground substance. On the other hand, dense connective tissue contains more tightly packed fibers that confer tensile strength and elasticity, making it suitable for making tendons, ligaments, and the dermal layer of the skin.