Epithelial tissue and cell types

Question 1

Simple squamous epithelia

Answer 1

Structure: Single flat layer of disc like cells

Location:
Air sacs of lungs 
glomeruli 
blood vessels and capillary lumens
body cavity linings 

Function: surface for filtration and diffusion

Question 2

Simple columnar epithelia

Structure
Function
Location

Answer 2

Structure: single layer-tall rectangular cells with elongated nuclei

Microvilli and cilia common on apical surface

Function in absorption and secretion

Location:
Digestive tract lining
Respiratory tract lining

Question 3

Stratified squamous epithelia

Found on skin

• lining of esophagus
• lining of vagina
• lining of mouth

Answer 3

Structure:
Multiple layers of squamous cells on a basement membrane

Surface cells are dead, flat and keratinized

Basal cells are cube-shaped and mitotically active

Function:
Protection against abrasion and damage for tissue underneath

Question 4

Pseudostratified columnar epithelia

Answer 4

Single layer of columnar cells of different heights

• Appears as multiple layers
• nuclei at different heights

Location:

• Male sperm duct
• respiratory tract
• large glands

Function: secretion and propulsion

Question 5

Classification of Glandular Epithelium

Answer 5

Endocrine-secretes hormones into localized capillaries

Exocrine- secrete their products into a duct

Question 6

Glandular Epithelium
Exocrine
(unbranched ducts)

Answer 6

Simple tubular
-intestinal glands
-Gastric glands
(glands are branched)

Simple alveolar:
Not found in adults

*Sebaceous glands (branched glands)

Question 7

Glandular epithelium

Branched ducts

Answer 7

Compound tubular
-Mucous glands (mouth)

Compound alveolar
mammary glands

Compound tubuloalveolar
-Salivary glands

Question 8

General classification of Exocrine Glandular Epithelium

Answer 8

Merocrine

Apocrine

Holocrine

Question 9

Classification of Exocrine Glandular Epithelium

MEROCRINE

Answer 9

Product secreted directly through plasma membrane by EXOCYTOSIS

i.e Salivary glands

Question 10

Classification of Exocrine Glandular Epithelium

APOCRINE

Answer 10

product secreted by pinching off of membrane, loss of cytoplasm

i.e mammary glands

Question 11

Classification of Exocrine Glandular Epithelium

HOLOCRINE

Answer 11

Product secreted by cell fully rupturing