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The tissue described as having an apical surface and a basement membrane is epithelial tissue. Epithelial tissue covers body surfaces, lines cavities and organs, and forms glands. The apical surface is the top layer that faces the exterior or the lumen of a cavity, while the basement membrane provides support and anchors the epithelium to underlying connective tissue.
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Is the Apical surface of the epithelium the deepest layer of cells?
No, the apical surface of the epithelium is not the deepest layer of cells; rather, it is the outermost layer that faces the lumen or external environment. The deepest layer of epithelial cells is referred to as the basal layer, which rests on the basement membrane. The apical surface is involved in functions such as absorption, secretion, and sensation, depending on the type of epithelium.
What type of tissue has an apical and basal surface?
Epithelial tissue lines body surfaces and cavities as have apical and basement sides.
Do epithelial tissues always exhibit polarity?
Yes, epithelial tissues typically exhibit polarity, with distinct apical and basal surfaces. The apical surface faces the external environment or a body cavity, while the basal surface is anchored to a basement membrane. This polarity allows for the specialized functions of epithelial cells, such as secretion and absorption.
What is a description of Pseudostratified ciliated epithelium?
Pseudostratified ciliated epithelium is a type of epithelial tissue found in the respiratory tract. It appears to be stratified due to the nuclei being at different levels, but all cells are in contact with the basement membrane. Most of the cells have cilia on their apical surface, which help in moving debris and mucus out of the respiratory system.
Are there cilia at the apical surface?
Yes, cilia are present on the apical surface of some cells. They serve various functions, such as moving substances along the cell surface or sensing the environment.
What type of tissue has an apical and basal surface?
Epithelial tissue lines body surfaces and cavities as have apical and basement sides.
All cells attached to the basement membrane but not all cells reach free surfaces is a description of what?
This describes the simple columnar epithelium tissue. In this tissue, all cells are attached to the basement membrane, but not all cells reach the free surface, as some may be buried below the apical surface of the tissue layer.
Do epithelial tissues always exhibit polarity?
Yes, epithelial tissues typically exhibit polarity, with distinct apical and basal surfaces. The apical surface faces the external environment or a body cavity, while the basal surface is anchored to a basement membrane. This polarity allows for the specialized functions of epithelial cells, such as secretion and absorption.
What is a description of Pseudostratified ciliated epithelium?
Pseudostratified ciliated epithelium is a type of epithelial tissue found in the respiratory tract. It appears to be stratified due to the nuclei being at different levels, but all cells are in contact with the basement membrane. Most of the cells have cilia on their apical surface, which help in moving debris and mucus out of the respiratory system.
Are there cilia at the apical surface?
Yes, cilia are present on the apical surface of some cells. They serve various functions, such as moving substances along the cell surface or sensing the environment.
What tissue that always has a top and a bottom?
Epithelial tissue always has a top and a bottom, characterized by its polarity. The top layer, known as the apical surface, is exposed to the external environment or internal body cavities, while the bottom layer, called the basal surface, is anchored to underlying connective tissue via the basement membrane. This arrangement allows epithelial tissue to perform functions such as absorption, secretion, and protection effectively.
Why is the apical surface considered to be a free surface?
The apical surface is considered a free surface because it is exposed to the external environment or a body cavity without being in direct contact with neighboring cells. This allows for functions like absorption, secretion, and sensory reception to occur at this surface.
Microscopic folds that extend from the apical surface of certain epithelia to increase the surface area for absorption and secretion are called?
These are called microvilli which means shaggy hair. They are tiny hairlike folds in the plasma membrane that extend from the surface of some cells. They are be seen as a "brush border" with a light microscope.
Does All epithelia have an apical surface and a basal surface?
Yes, epithelia have an apical surface facing the external environment or a body cavity and a basal surface attached to underlying connective tissue. These surfaces are important for cell polarity and function in processes such as absorption, secretion, and barrier formation.
Location of nucleus in columnar epithelial cell?
The nucleus in a columnar epithelial cell is typically located towards the base of the cell, closer to the basement membrane. This positioning allows for efficient packing of organelles in the apical region of the cell, facilitating secretion and absorption functions of the cell.
Which epithelium is highly absorptive due to increased surface area cause by microvilli found on free apical surface?
Enterocytes.
Is transitional epithelium highly absorptive because of increased surface area caused by microvilli found on free apical surface?
Yes
