Ch. 5.1 Tissues Organization Flashcards
Tissue
Groups of similar cells the work together towards a common function
histology
the study of tissue
What is the function of epithelial tissue?
Cover the bodies surface, lines body and organ cavities, and forms glands.
Define cellularity as it relates to epithelial tissue
Tightly packed cells with minimal extracellular matrix.
Polarity as it relates to epithelial cells
having an apical or basal surface
Apical Surface
the side of epithelial cells that is exposed to the outside or some internal body space. these surfaces might have microvilli or cilia on them.
Basal surface
Fixed surface that is attached to the basement membrane of connective tissue.
What are the three parts of the basement membrane?
Lamina lucida, lamina densa, and reticular lamina. Only visible with an electron microscope.
What are the three basement lanes made of?
Collagen, glycoproteins, and proteoglycans.
Avascularity
all epithelial tissue lacks blood vessels.
How much nervous tissue does epithelial tissue have?
Lots!
Stem cells- what do they do?
They are responsible for cell division at the base of epithelium, closest to the basement membrane. This cell division provides for the replacement cells necessary as the epithelium takes wake and tare on its apical surface.
What makes up glands?
Epithelial cells. May be one cell, or a group of cells.
what type of epithelial cells can be keratinized?
stratified squamous
endothelium- composition and location
simple squamous epithelium- lines blood vessels and lymph vessels.
mesothelium
simple squamous epithelium that forms the serous membranes of body cavities.