One is the endocardium, that covers with a lay of cells the lumen of heart chambers, the other one is the pericardium, that envelopes the hearth from outside.

Epithelial tissues are classified according to the number of cell layers that make up the tissue and the shape of the cells. Epithelial tissue cells are continually dividing for replacements of old, worn, or damaged cells. By … For instance, no blood vessels cross the basement membrane to enter the tissue, and nutrients must come by diffusion or absorption from underlying tissues or the surface.
2. An example is the epidermis, the outermost layer of the skin.

Many epithelial tissues are capable of rapidly replacing damaged and dead cells.

Epithelia cover the body surface, line body cavities and hollow organs, and form glands. The epithelial tissues are formed by cells that cover the organ surfaces, such as the surface of skin, the airways, surfaces of soft organs,the reproductive tract, and the inner lining of the digestive tract.The cells comprising an epithelial layer are linked via semi-permeable, tight junctions; hence, this tissue provides a barrier between the external environment and the organ it covers. Epithelium is a tissue composed of sheets of cells that are joined together in one or more layers. About this Book; Preface; I.Chapter 1. Which type of epithelial tissue is found lining the heart, blood vessels and lymphatic vessels? They form the external skin, the inner lining of the mouth, digestive tract, secretory glands, the lining of hollow parts of every organ such as the heart, lungs, eyes, ears, the urogenital tract, as well as the ventricular system of the brain and central canals of the spinal cord. Connective tissue is derived from the third germ layer, the mesoderm, which is the same source of origin of muscle tissue. Epithelium (/ ˌ ɛ p ɪ ˈ θ iː l i ə m /) is one of the four basic types of animal tissue, along with connective tissue, muscle tissue and nervous tissue.Epithelial tissues line the outer surfaces of organs and blood vessels throughout the body, as well as the inner surfaces of cavities in many internal organs. 1. Epithelial tissue forms a barrier between the body and the external environment and plays important roles in protection, filtration, absorption, excretion, and sensation. An Introduction to the Human Body This is further classified as. Epithelial tissue. There are two layers of epithelial cells in the heart. This tissue based on need is of different types as simple epithelium, squamous epithelium, columnar epithelium, etc. Simple epithelium. Simple squamous epithelium.

stratified squamous epithelium. This tissue is an uppermost tissue covering all the organs or body. The different types of connective tissue include adipose, fibrous, and elastic tissues as well as blood, bone, and cartilage.

Epithelial tissues are nearly completely avascular.