94. The layer of cells forming tissue that appears
to be multi-layered but actually some of the
cells extend from the basement membrane to
the surface is
(1) simple columnar epithelium
(2) pseudostratified epithelium
(3) stratified columnar epithelium
(4) stratified cuboidal epithelium
Answers
Answer:
pseudostratified epithilium
Explanation:
ANSWER 1 = epithelium
Some of the cells (long cells) extend from the basement membrane to the surface. Hence, although epithelium is one cell thick but it appears to be multilayered or stratified, thus called pseudo stratified.
ANSWER 1 = Simple epithelium has only one cell layer where every cell is in direct contact with the underlying basement membrane. Generally, this type of epithelium is found inside the body probably due to the fragile nature and forms the lining of the body cavities, blood and lymph vessels, heart and respiratory system.
Being a thin layer has the physiological advantage of faster absorption and filtration especially when it lines the digestive tract and exchange surfaces of the lungs.
ANSWER 2 = In some columnar epithelia, the cells become so crowded that some of the nuclei become displaced and several rows of nuclei appear in sections of the cell sheet, even though each cell is still attached to the basement membrane. In these cases, it is difficult to trace the continuity of different cells from base to apex and the epithelium may appear stratified even though it contains just one layer of cells. Such epithelia are called pseudostratified columnar epithelia. Pseudostratified columnar epithelia are most commonly found along the respiratory airways. These cells contain cilia on their apical surface. Cilia are motile, beating in a synchronous rhythm to move fluid in a constant direction. In the trachea, cilia propel mucous and particles toward the pharynx and out of the airways. Cilia are much longer than microvilli.
ANSWER 3 = Münstermann
Simple squamous epithelium
The human body is composed of four basic types of tissues, epithelium being one of them. It is present on almost every part of the human body, hence it has several important functions. For example, it has roles in protection, absorption, secretion, and sensation. Its dominant presence also suggests that there are various types of epithelia in order to cater for the varied human body structures.
The main classifications of epithelium are simple and stratified, each one being further divided into several subtypes according to two main factors: cell shape and apical surface specialization. This article will describe stratified (multi-layered) epithelium, focusing on its general characteristics and each major sub-type.
ANSWER 5 = Stratified cuboidal epithelium is a type of epithelial tissue found mainly in glands, which specialize in selective absorption and secretion by the gland into blood or lymph vessels. ... The layers of squamous epithelial cells beneath the cuboidal cells replace damaged cells as needed to maintain the epithelial lining.
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