Lesson 9: epithelial tissue characteristics Flashcards
What is the ECM in epithelial tissue?
Scarce
ECM stands for extracellular matrix, which is minimal in epithelial tissue.
How are epithelial cells characterized?
Abundant and juxtaposed
Epithelial cells are closely packed together.
What is the shape of epithelial cells?
Polygonal (with many faces)
This shape allows for efficient packing and connection.
How are epithelial cells joined together?
By the junctional complex
This complex facilitates communication and adhesion between cells.
What type of structure do epithelial cells have?
Polarized structure (apical, basal, lateral pole)
This polarization is crucial for their functions.
What supports epithelial tissue?
Basal lamina
The basal lamina provides structural support and anchoring.
What is a key characteristic of epithelial tissue regarding blood vessels?
Avascular tissue (does not contain blood vessels)
Epithelial tissue relies on diffusion for nutrient supply.
What are the two types of epithelial tissue?
Lining and glandular
Lining epithelial is for surfaces, while glandular is for secretion.
What is one function of lining epithelial tissue?
Protection of organ surfaces
An example is the epidermis, which protects underlying tissues.
What is another function of lining epithelial tissue?
Sensory: cells specialized in stimulus uptake
These cells can detect changes in the environment.
What is a function of glandular epithelial tissue?
Secretion of molecules and fluids
Glandular epithelium is responsible for producing secretions.
What does the basal membrane do?
Serves as an interface between epithelial tissue and underlying connective tissue
This membrane is crucial for tissue integrity.
What is an acellular structure?
Acellular structure
The basal membrane is acellular, meaning it does not contain cells.
What is one function of the basal membrane?
Adhesion of epithelial tissue to connective tissue
This adhesion is vital for maintaining tissue structure.
Fill in the blank: The basal membrane helps with _______ filtering between epithelial and connective tissues.
Molecule
This filtering is important for nutrient exchange.
What role does the basal membrane play in cell proliferation?
Regulation of cell proliferation and differentiation
This regulation is key for tissue maintenance and repair.
What does the basal membrane direct?
The migration of cells along the surface
This guidance is important during development and healing.
What are two mechanical properties of the basal membrane?
Strength and flexibility
These properties allow it to withstand various mechanical stresses.
