Epithelial Tissues Overview

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Questions and Answers

What is the primary function of squamous epithelium?

Absorption of nutrients
Secretion of hormones
Facilitating diffusion (correct)
Producing mucus

Where is cuboidal epithelium primarily found?

Inner surface of bronchioles
Lining of the stomach
Blood vessels
Ducts of glands and nephrons (correct)

What characteristic differentiates columnar epithelium from cuboidal epithelium?

Shape of the cells (correct)
Location in the body
Function in secretion
Presence of cilia

Ciliated columnar epithelium is particularly important for which of the following functions?

<p>Moving particles or mucus (B)</p> Signup and view all the answers

Which type of epithelium has microvilli on its free surface?

<p>Columnar epithelium (C)</p> Signup and view all the answers

Flashcards

Squamous epithelium

A thin layer of flattened cells with irregular boundaries, found in areas like blood vessel walls and lung air sacs. Its main role is forming a diffusion barrier.

Cuboidal epithelium

A single layer of cube-shaped cells, commonly found in gland ducts and kidney tubules. It's responsible for secretion and absorption.

Columnar epithelium

A single layer of tall, slender cells, located in areas such as the stomach and intestine. It plays a crucial role in secretion and absorption.

Microvilli

Tiny finger-like projections on the free surface of cells, enhancing surface area for absorption and secretion.

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Ciliated epithelium

Columnar or cuboidal cells with hair-like structures called cilia on their free surface, responsible for moving particles or mucus in a specific direction.

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Study Notes

Epithelial Tissues

Squamous Epithelium: Composed of a single layer of flattened cells with irregular edges. Found in blood vessel walls and lung air sacs. Functions include forming a diffusion boundary.
Cuboidal Epithelium: Composed of a single layer of cube-shaped cells. Commonly found in gland ducts and parts of the nephrons (kidneys). Functions include secretion and absorption. Proximal convoluted tubule (PCT) of the nephron has microvilli.
Columnar Epithelium: Composed of a single layer of tall, slender cells. Nuclei are located at the base. May have microvilli on the free surface. Found in stomach and intestinal lining, supporting secretion and absorption.
Ciliated Epithelium: Columnar or cuboidal cells with cilia on their free surfaces. These cells move particles or mucus in a specific direction. Primarily found in the inner linings of hollow organs, like bronchioles and fallopian tubes.