Epithelial

Question 1

Types of Tissue

Answer 1

Epithelial
Connective
Muscle
Nervous

Question 2

“laid on, covering”

Answer 2

“epithe” is a body sheet of cells that covers a body surface or lines a body cavity

Question 3

Two forms (occur in the body)

Answer 3

1. Covering and lining epeithelium
   -outer layer of the skin & inner most body organs
2. Glandular epithelium
   -forms most of the body glands

Question 4

Functions:

Answer 4

Protection
secretion
absorption
diffusion / excretion
filtration
sensory reception

Question 5

Special Characteristics of epithelia(plural)

Answer 5

Cellularity
specialized contacts
polarity
support by connective tissue
avascular but innervated
regeneration

Question 6

epithelial are composed entirely of cells; these cells are separated by a minimal amount of extra cellular material: projections of integral membranes proteins into the narrow spaces btw the cells

Answer 6

Cellularity

Question 7

It have
-Apical surface (exposed to external body: superficial or cavity of internal organ) &
-Basal surface (underlying connective tissue)

Answer 7

Polarity

Question 8

a tight junctions that help proteins in the apical region of the Plasma membrane from diffusing into the basal region, and does help to maintain it epithelial polarity

Answer 8

Specialized Contacts

Question 9

Epithelial sheets rest upon and or supported by connective issue. Just deep to the basal lamina is the reticular lamina, a layer of extra cellular material containing a fine network of collagen that “belongs to” the underlying connective tissue. The two lab in a form the basement membrane, which reinforces the epithelial sheet, helps it to resist stretching and tearing, and defines epithelial boundary 

Answer 9

Supported by connective tissue

Question 10

contains no blood vessels

Answer 10

avascular

Question 11

supplied by nerve fibers

Answer 11

innervated

Question 12

Epithelial tissue has no blood supply (avascular) which means it receives nutrients and other important substances from the underlying tissues through diffusion. This tissue is penetrated with nerve endings (innervated) such as in skin, nose, and ears which are important for sensory reception

Answer 12

Avascular but innervated

Question 13

If apical-basal polarity and lateral contacts are destroyed, epithelial cells begin to reproduce themselves rapidly. As long as epithelial Cells receive adequate nutrition, they can replace lost cells by process of mitosis or cell division

Answer 13

Regeneration

Question 14

Cell layers

Answer 14

Simple(single)
Stratified(many)

Question 15

Found were absorption and secretion and filtration occur and a thin epithelial barrier is desirable

Answer 15

Simple Epithelia

Question 16

Composed of two or more cell layers stacked on top of each other,
common in high-abrasion areas were protection is important
Skin surface and the lining up of the mouth

Answer 16

Stratified epithelia

Question 17

Shape of the cells

Answer 17

Squamous cells
cuboidal cells
Columnar cells

Question 18

single:
Lining of blood vessels in the heart, lympathic vessels, alveoli of the lungs, and portions of the kidney tubules

Function: Allows materials the pass by diffusion and filtration insights were protection is not important; secretes lubricating substances and serosae.

Answer 18

Simple squamous epithelium

Question 19

single:
kidney tubules, surfaces of the ovary, glands and their ducts lining of the terminal bronchioles of the lungs

Function: secretion and absorption

Answer 19

Simple cuboidal epithelium