Question

Which of the following is the characteristic of epithelial tissues?
(a)They are avascular and innervated.
(b)They have a rapid rate of cell division
(c)They have less intercellular spaces
(d)All of the above

Answer 1

Hint: Tissues are a group of cells that perform specific functions and create protective boundaries. They are organized in proximity and support other tissue types.

Complete answer:
Epithelial tissues survey protective layers and are components of body organs and systems. They consist of a special sense and act as receptors in sensory capacities. They possess common characteristics to their fundamental capabilities and have some common attributes such as limited intercellular spaces, single or multiple layers of cells, free apical surfaces, avascular and mitotic capability. The membranes hold special intercellular junctions that wholesale epithelial cells tightly together and restrict intercellular spaces between the cells. These cells lack blood vessels and are classified as avascular which are not able to deliver nutrients and eliminate waste from the epithelium which is done by the nearby connective tissues with their functions of blood vessels. They serve as a covering for all lining tissue and are subject to wear and tear. They can divide and form new cells which is the mitotic capability that enables them to engage in retirement and regeneration of activities.

Additional Information: Epithelial cells contain single or multiple layers of cells that form linings or coverings. It consists of a single cohesive layer which is cemented together or the multiple layers. The type of epithelium is dictated by the location and function of a site. It constitutes free apical surfaces that take place during maturity or development. The secretion, absorption, and excretion functions occur where the apical surfaces are. The basal surface which is located opposite to the apical surface gets attached to the underlying tissue with a specialised basement membrane that rests on connective tissue.

So, the correct answer is 'All of the above'.

Note: The epithelial cells are present throughout the body and lines the body cavities and hollow organs. Epithelium cells constitute the outer skin which has an important function in performing a mechanical defence against infection.