Final answer:
The three "loose connective tissues" are areolar, adipose, and reticular tissues, all of which serve to support and hold other tissues and organs in place.
Step-by-step explanation:
The three tissues known as "loose connective tissues" are: areolar, adipose, and reticular. Loose connective tissue, or areolar tissue, is a type of connective tissue proper that serves to hold organs in place and is found around every blood vessel. Adipose tissue is another type of loose connective tissue that is involved in the storage of energy reserves and insulating the body. Reticular tissue, the third type, provides a supportive framework for soft organs. These tissues are characterized by a semi-fluid ground substance that contains varied cell types and protein fibers.