Tissues Tissues Tissue = a group of cells (and their Tissue = a group of cells (and their extracellular products) that share a extracellular products) that share a similar structure or function. similar structure or function. Each organ is made up of Each organ is made up of several several tissue tissue types types . .
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Tissues Tissue = a group of cells (and their extracellular products) that share a similar structure or function. Each organ is made up of several tissue.
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TissuesTissuesTissue = a group of cells (and their extracellular Tissue = a group of cells (and their extracellular
products) that share a similar structure or function.products) that share a similar structure or function.
Each organ is made up of Each organ is made up of severalseveral tissue tissue typestypes..
Classification of Epithelia must be in this Classification of Epithelia must be in this order:order:
1. Number of cell layers1. Number of cell layers– Simple – one cell layer resting on the basal laminaSimple – one cell layer resting on the basal lamina– Stratified – >1 cell layer thick, only basal layer rests on Stratified – >1 cell layer thick, only basal layer rests on
basal laminabasal lamina– Pseudostratified – looks stratified, but all cells are Pseudostratified – looks stratified, but all cells are
actually in contact with BL.actually in contact with BL.
2. Shape of the most superficial layer of cells2. Shape of the most superficial layer of cells– Squamous – flattened in shapeSquamous – flattened in shape– Cuboidal – cube-shaped or squareCuboidal – cube-shaped or square– Columnar – rectangular or elongated with respect to the Columnar – rectangular or elongated with respect to the
basal laminabasal lamina
3. Surface specializations3. Surface specializations– Ciliated or non-ciliatedCiliated or non-ciliated– Keratinized or non-keratinizedKeratinized or non-keratinized– Brush border (microvilli) or stereociliaBrush border (microvilli) or stereocilia– Goblet cellsGoblet cells
Simple squamous epithelium of capillaries
kidney tubuleskidney tubules
Human kidneyHuman kidney
DuodenumDuodenum
Gobletcell
Microvilli(striated border)
Slide 53a
EsophagusEsophagus
classify thisepithelium
Thick skin
keratin
StratifiedSquamous Epithelium
TracheaTrachea Epididymis
Pseudostratified Epithelium
cilia stereocilia
Transitional EpitheliumTransitional Epithelium lining the Bladder lining the Bladder
1. a. Name the space at the pointer.1. a. Name the space at the pointer.
1.b. Identify the tissue lining that space. (Be specific.)
2.a. Identify the structure at the pointer.2.a. Identify the structure at the pointer.b. What is its main function?b. What is its main function?
Structure and Function are Structure and Function are Connected!Connected!
Simple squamous epithelium Simple squamous epithelium indicates lots of transport across it.indicates lots of transport across it.