Epithelial tissue is composed of cells laid out in sheets with strong cell-to-cell attachments. These protein connections hold the cells together to form a tightly connected layer that is avascular but innervated in nature.

Whereas anatomy is about structure, physiology is about function. Human physiology is the scientific study of the chemistry and physics of the structures of the body and the ways in which they work together to support the functions of life.

Connective tissue is the most abundant tissue type in our body. This shows that connective tissue is very important in providing support and protection in our body.

Simple epithelium

Simple cuboidal epithelia are found on the surface of ovaries, the lining of nephrons, the walls of the renal tubules, and parts of the eye and thyroid, along with the salivary glands. On these surfaces, the cells perform secretion and absorption.

Cuboidal epithelium (with cube-shaped cells) forms the lining of kidney tubules and ducts of salivary glands, where it provides mechanical support. Epithelial cells often acquire additional specialisation as gland cells, which can secrete substances at the epithelial surface.

Ciliated epithelium performs the function of moving particles or fluid over the epithelial surface in such structures as the trachea, bronchial tubes, and nasal cavities. It often occurs in the vicinity of mucus-secreting goblet cells.

The ciliated epithelium is the columnar epithelium that has cilia. They are present in the inner surface of bronchioles and fallopian tubes. The main function of these cells is to move particles in a specific direction.

d)Ciliated Certain cuboidal or columnar cell have hair like projections on the outer surface called cilia. Such cells form ciliated epithelium. They are found in sperm ducts,trachea,bronchi,kidney tubules,fallopian tubes. The beating of the cilia moves solid particles in one direction through ducts.

Among the animal tissues, connective tissues are the most abundant ones in the body. The connective tissue cells are freely arranged in a matrix and are widely distributed in the body. Different types of connective tissues include areolar tissue, adipose tissue (fat), blood, bone, and cartilage.

Major functions of connective tissue include: 1) binding and supporting, 2) protecting, 3) insulating, 4) storing reserve fuel, and 5) transporting substances within the body. Connective tissues can have various levels of vascularity. Cartilage is avascular, while dense connective tissue is poorly vascularized.

White and yellow fibres. White fibres are thin wavy unbranched inelastic occur in bundles and formed of protein collagen. Yellow fibres are thick straight elastic branched occuring singly formed of protein elastin.

Specialized connective tissues include a number of different tissues with specialized cells and unique ground substances. Some of these tissues are solid and strong, while others are fluid and flexible. Examples include adipose, cartilage, bone, blood, and lymph.

The two types of fibres which are mainly found in the connective tissue are the fibrous tissue or the fibroblast and the collagen fibres.