Does epithelial tissue have blood vessels?
Epithelial tissue cells are avascular so they are nourished by substances diffusing from blood vessels in the underlying connective tissue.
Oxygen is diffused through the basal lamina.
whereas most tissue are vascular (contain blood vessels), epithelium is avascular, meaning it lacks blood vessels. epithelial cells receive their nutrients from capillaries in the underlying connective tissue. although blood vessels do not penetrate epithelial sheets, nerve endings do; that is, epithelium is innervated (supply organ with nerve).
Epithelial cells are the lining cells. they are not a tissue. this is to be understood first. the outermost lining is known as the epithelial cell lining. it is provided its nutrition through diffusion- indirectly through blood. BUT they DO NOT have a blood vessel supply, since they are not an organ/tissue, just a cell lining.
The heart is a muscle, and as such has multiple tissues. The main tissue is cardiac muscle cells. These are striated, branched muscle cells held together with intercalated discs. Connective tissue forms a sac around the heart, and epithelial tissue forms blood vessels within the heart. Therefore, the heart contains all four types of tissue. It is mostly muscle tissue. Connective tissue forms a protective sac and holds the heart together, epithelial tissue forms the…
Connective tissue may or may not be avascular - it depends on the composition of the connective tissue. Avascular tissue is any tissue that does not contain blood vessels or lymphatics. Examples include epithelial tissue layers and the cornea. Elastic fibers, a form of connective tissue is avascular, but muscle is vascular.
Connective tissues are based on fibrous proteins, and include bones, cartilage, tendons, ligaments, and adipose tissue (stores fat). Blood and lymph are generally classified as "fluid connective tissue" although they do not have a fixed structure and are normally constrained by epithelial cells, such as those lining the blood vessels.
The serous membrane contains the epithelial layer and the connective tissue layer. The epithelial layer produces cells that produce lubricating serious fluid. The Connective tissue later houses blood vessels and nerves and serves as the "binding layer" for the serous membrane to adhere to organs and other structures in the body.
== Epithelial tissue is located on the very outside of an organ or organism (i.e. skin) or found lining lumen (cavities in hollow organs (i.e. stomach lining). Epithelial tissue always has a free surface (no contact with another cell). Epithelial tissue is also avascular (no blood vessels) and must depend on underlying tissues for the nutrients and oxygen it needs to maintain homeostasis. For this reason, epithelial tissue is usually very thin. Another characteristic of…