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The epithelium consists largely or entirely of closely packed cells with little or no intercellular material between adjacent cells. The points of attachment between adjacent plasma membranes of epithelial cells are called ______.
The epithelium consists largely or entirely of closely packed cells with little or no intercellular material between adjacent cells. The points of attachment between adjacent plasma membranes of epithelial cells are called ______.
cell junctions
Epithelial cells are arranged in continuous sheets that may be either single or multilayered. Nerves may extend through these sheets, but blood vessels do not and so epithelia are ______.
Epithelial cells are arranged in continuous sheets that may be either single or multilayered. Nerves may extend through these sheets, but blood vessels do not and so epithelia are ______.
avascular
Both types of epithelium get their nutrients and remove their wastes from blood vessels located in the underlying connective tissue. The epithelia adhere firmly to the connective tissue and this holds them in position and prevents them from being torn. The surface of attachment between the epithelium and the connective tissue is a thin extracellular layer called the ______.
Both types of epithelium get their nutrients and remove their wastes from blood vessels located in the underlying connective tissue. The epithelia adhere firmly to the connective tissue and this holds them in position and prevents them from being torn. The surface of attachment between the epithelium and the connective tissue is a thin extracellular layer called the ______.
basement membrane
Simple epithelium is found in areas that have minimal wear and tear where the epithelium is specialised for ______ or filtration.
Simple epithelium is found in areas that have minimal wear and tear where the epithelium is specialised for ______ or filtration.
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Stratified epithelium is found in areas with a high degree of wear and ______.
Stratified epithelium is found in areas with a high degree of wear and ______.
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Pseudostratified epithelium has only one layer of cells but some cells do not reach the surface, giving the tissue a multilayered, or ______, appearance.
Pseudostratified epithelium has only one layer of cells but some cells do not reach the surface, giving the tissue a multilayered, or ______, appearance.
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Squamous cells are flattened and scale like and are attached to each other like a ______.
Squamous cells are flattened and scale like and are attached to each other like a ______.
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Cuboidal cells are usually cube-shaped in cross-section and sometimes appear as ______.
Cuboidal cells are usually cube-shaped in cross-section and sometimes appear as ______.
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Columnar cells are tall and cylindrical, appearing as rectangles set on ______.
Columnar cells are tall and cylindrical, appearing as rectangles set on ______.
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Transitional cells often have a combination of shapes. They are found where there is a great degree of distension or expansion in the body. In the bottom layer of an epithelial tissue, transitional cells may range in shape from cuboidal to columnar. In the intermediate layer, they may be cuboidal or ______.
Transitional cells often have a combination of shapes. They are found where there is a great degree of distension or expansion in the body. In the bottom layer of an epithelial tissue, transitional cells may range in shape from cuboidal to columnar. In the intermediate layer, they may be cuboidal or ______.
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Cells are highly organized units. ◼ BUT they do not function in isolation. ◼ They work together in a group of similar cells called a ______.
Cells are highly organized units. ◼ BUT they do not function in isolation. ◼ They work together in a group of similar cells called a ______.
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There are 4 principal types : ◼ ______ TISSUE ◼
There are 4 principal types : ◼ ______ TISSUE ◼
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◼ ◼ CONNECTIVE ______ ◼
◼ ◼ CONNECTIVE ______ ◼
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MUSCULAR ______ ◼
MUSCULAR ______ ◼
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NERVOUS ______ ◼
NERVOUS ______ ◼
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It lines the body cavities. It lines the interiors of the respiratory and digestive tracts, blood vessels and ducts. It forms the outer covering of the external body surfaces and of some internal organs. It makes up (along with nervous tissue) the parts of the sense organs that are sensitive to stimuli that produce smell and hearing sensations. It is the tissue from which gametes develop. ______ epithelium
It lines the body cavities. It lines the interiors of the respiratory and digestive tracts, blood vessels and ducts. It forms the outer covering of the external body surfaces and of some internal organs. It makes up (along with nervous tissue) the parts of the sense organs that are sensitive to stimuli that produce smell and hearing sensations. It is the tissue from which gametes develop. ______ epithelium
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Study Notes
Epithelial Tissue Structure
- Epithelial cells are closely packed with little or no intercellular material between adjacent cells.
- Epithelial cells are arranged in continuous sheets, which can be single or multilayered.
- Nerves may extend through these sheets, but blood vessels do not, making epithelia avascular.
- Epithelial cells get their nutrients and remove wastes from blood vessels located in the underlying connective tissue.
Epithelial Tissue Attachment
- The epithelium adheres firmly to the connective tissue, held in position by a thin extracellular layer called the basement membrane.
- This attachment prevents the epithelium from being torn.
Types of Epithelial Tissue
- Simple epithelium: found in areas with minimal wear and tear, specialized for absorption or filtration.
- Stratified epithelium: found in areas with a high degree of wear and tear.
- Pseudostratified epithelium: has only one layer of cells, but appears multilayered due to some cells not reaching the surface.
- Squamous cells: flattened and scale-like, attached to each other like a tile.
- Cuboidal cells: usually cube-shaped in cross-section, sometimes appearing as rectangles.
- Columnar cells: tall and cylindrical, appearing as rectangles set on end.
- Transitional cells: have a combination of shapes, found in areas with a great degree of distension or expansion.
Tissue Functions
- Epithelial tissue lines the body cavities, respiratory and digestive tracts, blood vessels, and ducts.
- It forms the outer covering of the external body surfaces and some internal organs.
- It makes up parts of the sense organs sensitive to stimuli that produce smell and hearing sensations.
- It is the tissue from which gametes develop.
Cellular Organization
- Cells are highly organized units that work together in a group of similar cells called a tissue.
- There are four principal types of tissue: epithelial tissue, connective tissue, muscular tissue, and nervous tissue.
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Test your knowledge about the tissue level of organisation in living organisms. Learn about the different types of tissues and their functions in the body.
