Lesson 2.1 Epithelial tissue

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Tightly packed cells that coat the body's internal and external surfaces, with a free (exposed) surface and anchored to a basement membrane

What is epithelial tissue?

Protection, Secretion, Absorption, Filtration

What are the 4 main functions of epithelial tissue?

A layer of extracellular matrix that anchors epithelial tissue on the opposite side from the free surface

What is the basement membrane in epithelial tissue?

ONE layer of THIN, FLAT cells - allows rapid diffusion and filtration

Simple Squamous Epithelium - Structure and Function

Alveoli of lungs, Lining of blood vessels, Lymphatic vessels, Glomeruli of kidneys, Lining of body cavities and capillary walls

Simple Squamous Epithelium - Locations (5 places)

Single layer of CUBE-SHAPED cells that secrete and absorb substances

Simple Cuboidal Epithelium - Structure and Function

Glands (thyroid and salivary glands), Lining of kidney tubules

Simple Cuboidal Epithelium - Locations

Single layer of COLUMN-SHAPED (tall) cells that secrete and absorb substances

Simple Columnar Epithelium - Structure and Function

Lining of digestive tract, Bronchi of lungs, Uterine tubes

Simple Columnar Epithelium - Locations

MULTIPLE layers of cells, superficial layers are FLAT (squamous), deeper layers are cuboidal/columnar - provides PROTECTION in high-abrasion areas

Stratified Squamous Epithelium - Structure and Function

Keratinized (skin/epidermis) and Non-keratinized (mouth, esophagus, vagina, cornea)

Stratified Squamous Epithelium - Two Types

Sweat glands, Mammary glands, Salivary glands, Pancreatic glands - primarily provides protection and secretion

Stratified Cuboidal Epithelium - Locations

Single layer of cells BUT nuclei positioned to look like multiple layers (fake stratification)

Pseudostratified Columnar Epithelium - Structure

Contains CILIA on apical surface, Lines the respiratory tract (trachea, bronchi) to move mucus

Pseudostratified Columnar Epithelium - Key Feature and Location

Forms lining of hollow urinary organs, Has ability to CHANGE SHAPE

Transitional Epithelium - Structure and Function

Bladder - allows more urine to flow through by stretching when full and shrinking when empt

Transitional Epithelium - Location and Why