Types of Epithelium 1. Glandular 2. Covering or lining
Characteristics of Epithelium 1. Have free surface- exposed to external orientation and a basal surface attached to basal lamina 2. Avascular 3. Have a nerve supply 4. High capacity for renewal
Covering or Lining Epithelium Cells organized in...
BIO 446L- Exam 1 Questions and
Verified Answers
Types of Epithelium ✅1. Glandular
2. Covering or lining
Characteristics of Epithelium ✅1. Have free surface- exposed to external orientation
and a basal surface attached to basal lamina
2. Avascular
3. Have a nerve supply
4. High capacity for renewal
Covering or Lining Epithelium ✅Cells organized into one or more layers that cover
external surface or line cavities of organs
Types:
1. Simple epithelia- one cell layer
-Squamos
-Cuboidal
-Columnar
2. Stratified- 2 or more layers
4 Types of tissues ✅1. Connective- abundant in ECM
2. Epithelial- elongated cells specialized for contraction and movement
3. Muscular- elongated cells specialized for movement
4. Nervous- long fine cells specialized to generate and receive nerve impulses
Functions of Epithelia ✅1. Cover, line, protect surfacese
2. Absorption
3. Secretion- glands
4. Lubrication of surfaces
5. Formation of surface for diffusion
6. Transportation, sensory reception, and reproduciton
Compostion of epithelium ✅-Polyhedral cells with strong adhesion to thin layer of
extracellular matrix
-Rests on layer of connective tissue that brings in Oxygen and nutrients= lamina propria
-area underneath connective tissue increased by papillae
Parenchyma ✅Cells responsible for organ's specialized function
, Stroma ✅Cells that have supporting role in organ
-Always connective tissue expect in spinal chord and brain
Holocrine secretion ✅cells accumulate product as they mature and undergo
differentation, cumulates in complete cell disruption with release of product and cell
debris in gland's lumen
White adipose tissue ✅-Uniocular
-Nucleus and cytoplasm displaced against cell memberane
-Synthesize and store triglycerides
-At birth uniformly distributed but changes with sex hormones
-Reinforced by intermediate filament vitemin
-secretes leptin- saiety factor
Brown fat ✅-Multiocular
-Involved in nonshivering thermogenesis
-Central nuclei
-Numerous mitochondria
Shapes of Epithelial Cells ✅1. Columnar
2. Cuboidal
3. Squamos
Nucleus Shape
1. Oval
2. Spherical
3. Flattened
Reticular Lamina ✅Contains collagen type III and bound to basal lamina
Basal Lamina ✅Fxn: Binds epithelium to underlying connective tissue
-Composed of Type IV collagen, laminin, enactin, and proteoglycans
-macromolecules secreted at basal poles of thelium
Basal pole ✅contains connective tissue
Apical pole ✅Faces a space
Lateral surfaces ✅regions of cuboidal or columnar cells aligning to neighbor cells
Basement Membrane ✅Made of basal lamina and reticular lamina
-feltlike extracellular material
Fxn:
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