Lesson 2

Question 1

 The epithelial tissues cover external body surfaces
 Provide lining of the internal surfaces
 Cells are arranged very closely with little intercellular substance between
 Arranged as sheets covering or lining surfaces as masses of cells as in glands

• CATEGORIES
  o Simple epithelium
  o Stratified epithelium
  o Glandular or pyramidal epithelium

Answer 1

EPITHELIAL TISSUES

Question 2

CLASSIFICATION OF EPITHELIAL TISSUES

Answer 2

 NUMBER OF CELL LAYER
 EXOCRINE
 MORPHOLOGICAL STRUCTURE (SHAPE)
 ENDOCRINE

Question 3

 Composed on one layer of cells all attached to the basement membrane
* Simple squamous epithelium
o Usually seen in the lining of vessels (endothelium), or in the lining of cavities (mesothelium) such as pericardium.

Answer 3

SIMPLE EPITHELIUM

Question 4

o May be either ciliated or non-ciliated
o All cells adhere to the basal lamina, but not all cells reach the surface.
o Nucleus are not uniform
o Presence of cilia
o Lining of respiratory tract, reproductive tract

Answer 4

• Pseudostratified columnar epithelium

Question 6

 Composed of more than one layer of cells
 Only the basal cells are attached to the basement membrane

Answer 6

STRATEFIED EPITHELIUM

Question 7

 Serous glandular epithelium - pancreas, parotid glands
* Acinus – rounded secretory unit
* Usually seen in salivary grands
* SALIVARY GLANDS
o PAROTID - Serous Acinus
o SUBLINGUAL - Under the tongue, mucous acinus
o SUBMANDIBULAR - Serous and Mucous
 Serous – secretes proteins in an isotonic watery fluid, dark
 Mucous – secretes mucin (lubricant), light bubble-like

Answer 7

GLANDULAR OR PYRAMIDAL EPITHELIUM