Histology Lecture 2: Epithelial Tissue

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Questions and Answers

What is a key characteristic of epithelial tissue regarding its blood supply?

It has its own blood supply.

It is highly vascularized and well supplied with blood vessels.

It has a robust lymphatic supply.

It is avascular and relies on diffusion. (correct)

Which statement best describes the turnover time of epithelial tissue compared to connective tissue?

Connective tissue regenerates faster than epithelial tissue.

Both tissues have the same turnover rate.

Epithelial turnover time is slower due to lower mitotic activity.

Epithelial turnover time is faster due to higher mitosis in basal cells. (correct)

What role do cell junctions play in epithelial tissue?

They provide structural integrity by connecting cells. (correct)

They act as a source of nutrition for epithelial cells.

They function as a barrier to all forms of permeability.

They serve as the primary blood supply.

Which of the following is NOT a type of cell junction in epithelial tissue?

Blood junctions Signup and view all the answers

What is a defining characteristic of the basement membrane in epithelial tissue?

It separates epithelial tissue from underlying connective tissue. Signup and view all the answers

How does epithelial tissue regenerate and repair itself?

By cell division in deeper layers releasing and regaining desmosomal connections. Signup and view all the answers

What happens to epithelial cells during turnover time?

Older cells are lost while younger cells proliferate. Signup and view all the answers

How does the turnover time of the oral mucosa compare to that of the skin?

It is faster than that of the skin. Signup and view all the answers

What is the role of the clot in tissue repair?

It acts as a guide to form a new epithelial surface. Signup and view all the answers

What occurs immediately after an injury to the skin or oral mucosa?

A clot forms from blood products and an inflammatory response is triggered. Signup and view all the answers

What is the initial formation that occurs during the repair process after an injury?

Clot formation. Signup and view all the answers

What happens to the clot after the epithelial surface is repaired?

It is broken down by enzymes. Signup and view all the answers

During the repair process, which of the following tissues also undergoes repair alongside the epithelium?

Connective tissue. Signup and view all the answers

What notable difference occurs to the clot in the oral cavity compared to on the skin?

It stays moist in the oral cavity but dries out on the skin. Signup and view all the answers

Study Notes

Epithelial Tissue Definition and Structure

Epithelial tissue lines inner and outer body cavities and is found in ectoderm, endoderm, and mesoderm.
Two basic structures of epithelial tissue are basement membrane and cell junctions.
Epithelial tissue is innervated but avascular, and it must be nourished by substances diffusing from blood vessels in the underlying tissue.

Epithelial Tissue Structure

Cell junctions are contact points between plasma membrane and tissue cells.
There are five main types of cell junctions: tight junctions, adherent junctions, desmosomes, hemi-desmosomes, and gap junctions.

Functions of Epithelial Tissue

No specific functions mentioned in the text.

Classification of Epithelial Tissue

No classification mentioned in the text.

Epithelium Regeneration, Turnover, and Repair

Turnover of epithelium in skin or oral mucosa occurs due to cell division during regeneration.
Cells release and regain desmosomal connections at intercellular junctions in more superficial locations.
Turnover time is faster in epithelium compared to connective tissue due to higher level of mitosis in deepest dividing cells near basement membrane.
Older, superficial epithelial cells are shed or lost at the same rate as deeper germinal cells divide into more cells during turnover time.
Epithelium of oral mucosa generally has a faster turnover time than epidermis of skin.
Differences in turnover time are especially noted during repair or healing of tissue after injury.
Immediately after injury, a clot from blood products forms in the area, and the inflammatory response is triggered by white blood cells from blood supply as they migrate into the tissue.
Repair process involves formation of granulation tissue, tissue remodeling, and formation of scar tissue.
The clot is important in repair of epithelium and must be retained in the first days of repair, acting as a guide to form a new surface.

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Description

Explore the definition, structure, and characteristics of epithelial tissue, including its innervation and vascularization. Learn about the two basic structures of epithelial tissue, basement membrane and cell junctions.