Loose Connective Tissue

The areolar tissue and the adipose tissue are classified under the loose connective tissue. This tissue has cells and fibres that are loosely arranged in the semifluid ground substance. The areolar tissue has fibrous extracellular molecules and a number of different cell types. These include a ground substance, the matrix, fibroblasts, mast cells, and macrophages.

Dense Connective Tissue

In the dense connective tissue, the fibres and fibroblasts are compactly packed. The dense connective tissue can be further classified into dense regular and dense irregular connective tissue, depending on the regularity/irregularity of the collagen fibres.

Specialized Connective Tissue

The three specialized connective tissues are Blood, bones, and cartilage.

Blood

Blood is a fluid connective tissue. It consists of a liquid matrix called as the plasma, in which blood cells are present. It travels all around the body in blood vessels. So blood helps in the transport of gases, nutrients, hormones as well as the elimination of the waste materials.There are three types of blood cells that are found in the plasma. They are the Red blood cells (RBC) or Erythrocytes; White blood cells or Leucocytes (WBC) and Thrombocytes or Blood Platelets. The RBCs and the WBC’s are the living components of the blood.The RBCs have a pigment called hemoglobin, due to which blood appears red in color. The WBCs help in protecting the body by attacking any foreign body that enters into the body, while the blood platelets are responsible for clotting of blood.

Bones

Bones are the hard connective tissue. They give support and framework to the body. They protect the internal organs and the muscle tissue attached to the bones helps in movement. The bone tissue is strong and non-flexible. The cells are embedded inside a hard matrix, which is made up of proteins, calcium and phosphorous. And bones are rich in calcium salts and collagen fibres, giving them the strength.

Cartilage

Cartilage is another type of connective tissue that has a solid matrix. It contains proteins and sugars. The cartilage tissue has widely spaced cells. Cartilage is also an important connective tissue as it helps in smoothening the bone surfaces at the joints. Cartilage is also present in the trachea, nose, ears, and larynx.