What are the 4 classes of connective tissue?

1. Dense connective tissue. This type of connective tissue is characterized by closely packed collagen fibers, which make it strong and resistant to stretching. It is found in tendons, ligaments, and the dermis of the skin.

2. Loose connective tissue. This type of connective tissue is characterized by loosely arranged collagen fibers, which make it flexible and easy to stretch. It is found in the subcutaneous tissue, around blood vessels and nerves, and in the walls of organs.

3. Adipose tissue. This type of connective tissue is characterized by the presence of fat cells, which store energy. It is found throughout the body, but is particularly abundant in the abdomen, thighs, and buttocks.

4. Cartilage. This type of connective tissue is characterized by the presence of specialized cells called chondrocytes, which secrete a matrix of collagen and other proteins. Cartilage is found in the joints, the ears, the nose, and the trachea.