Question

Give the structure and function of different types of epithelial tissue
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Answer 1

Explanation:

Overview and types of epithelial tissue

Cell shape classification Squamous, cuboidal, columnar

Functions Secretion, absorption, transportation, protection, receptor function (sensation)

Answer 2

Answer:

Explanation:Epithelium is one of only 4 types of human body tissues. Like all types, it is formed by cells within an extracellular matrix (ECM).  

The cells in this tissue are tightly packed within a thin ECM. Forming sheets that cover the internal and external body surfaces (surface epithelium) and secreting organs (glandular epithelium). Functions of epithelial tissue are secretion, protection, absorption, transportation and special sensory receptive.

Think epithelial tissue is not so interesting? What until you read about all its specializations! This page will introduce you to the histology, characteristics and functions of epithelial tissue.Epithelial cells are the building blocks of epithelial tissue. Like every other cell, they are surrounded by cellular membranes. Epithelial cell membranes have three regions (domains) different in structure and function; apical, lateral and basal. This feature is called membrane polarity.  

Polarity  

Plasma membrane; Image: Paul Kim

Plasma membrane

Each membrane pole exhibits various features. These can include receptors and channels for transportation of substances that the epithelial cell needs to internalize or expel, or membrane specializations.

Apical poles project towards the external surface or the lumen of an organ which epithelia cover, which is why they’re also called free surfaces or free domains. This pole may also show apical membrane specializations which alter the shape of this surface. Lateral surfaces are the sites where adjacent cells interconnect, forming tightly packed contiguous cells. Basal surfaces are in contact with the underlying basement membrane. As both lateral and basal surfaces are adjusted to interact with surrounding structures, they’re often mentioned together as a basolateral surface.  

Apical specializations

Apical specializations are different types of fingerlike cytoplasmic extensions of the apical surface. They differ in their length, motility and function. There are three types of specializations

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