Epithelial Tissue Overview

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Questions and Answers

What are the general histological characteristics of epithelial tissue?

Epithelial tissue is characterized by being crowded with cells, minimal intercellular substance, resting on a basement membrane, avascular, highly innervated, and having a high power of regeneration.

Differentiate between simple and stratified epithelium and provide examples of where each can be found.

Simple epithelium consists of a single layer of cells found in areas requiring diffusion, such as alveoli, while stratified epithelium has multiple layers, offering protection, like in the skin.

What roles do glandular epithelium play in the body?

Glandular epithelium is specialized for secretion, producing hormones, enzymes, and other substances necessary for bodily functions.

How does neuro-epithelium differ from surface epithelium?

Neuro-epithelium is modified to receive stimuli and is involved in sensory functions, while surface epithelium primarily serves as a protective layer covering surfaces. Signup and view all the answers

Describe the significance of epithelial tissue being avascular and how it receives nourishment.

Being avascular means epithelial tissue lacks blood vessels and receives nutrition via diffusion from underlying connective tissue, which is crucial for maintaining its functions. Signup and view all the answers

What are the primary functions of simple squamous epithelium, and where is it commonly found?

The primary functions include facilitating fluid flow and gas exchange. It is commonly found lining the heart, blood vessels, serous membranes, alveoli of lungs, and Bowman's capsule of the kidney. Signup and view all the answers

Describe the structure and function of simple cuboidal epithelium.

Simple cuboidal epithelium is composed of a single layer of cube-like cells with central nuclei. Its primary function is secretion, commonly seen in thyroid follicles. Signup and view all the answers

What distinguishes simple columnar epithelium from simple cuboidal epithelium and what are its functions?

Simple columnar epithelium consists of taller cells with basal oval nuclei, primarily involved in secretion and absorption. It is found in organs like the stomach and intestines. Signup and view all the answers

What role do cilia play in simple columnar ciliated epithelium, and where can this type of epithelium be found?

Cilia help to move fluid or particles in one direction. This type of epithelium is found in the uterus, Fallopian tubes, and bronchioles. Signup and view all the answers

Explain the significance of basement membrane in epithelial tissues.

The basement membrane provides structural support and anchorage for epithelial cells. It also plays a role in regulating the exchange of materials between the epithelium and underlying tissues. Signup and view all the answers

Flashcards

Simple Squamous Epithelium

A single layer of flat cells, often involved in diffusion and filtration.

Epithelial Tissue Classification

Epithelial tissue is categorized into surface epithelium (covering surfaces or lining cavities), glandular epithelium (secreting cells), neuro-epithelium (sensing stimuli), and myo-epithelium (contractile cells).

Epithelial Tissue Characteristics

Epithelial cells are tightly packed, rest on a basement membrane, and lack blood vessels (avascular). It receives nutrients via diffusion and has high regeneration.