Homework 4A (unit 1) – Flashcards
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Which statement below is NOT a characteristic of epithelia?
-Epithelia are highly vascularized
-Epithelia is innervated; it contains nerve endings
-Epithelia contain many cells closely packed together with little extracellular material
-Epithelia have a "free" apical region and a basal region adjacent to underlying connective tissue
answer
Epithelia are highly vasularized
(Epithelia are NOT vascularized. All epithelia receive oxygen and nutrients, and get rid of cellular wastes via diffusion with the underlying highly vascularized connective tissue)
question
Which type of cell junction is also referred to as an anchoring junction?
Tight junction
Desmosome
Adhesion proteins
Gap junction
answer
Desmosome
(Desmosomes are called anchoring junctions because proteins extending from adjacent cell membranes link adjoining cells. These junctions allow for movement and greater spacing between adjacent cells)
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The lateral surfaces of epithelial cells are characterized by _______.
-specialized cell junctions
-cilia
-microvilli
-a basal lamina
answer
specialized cell junctions
(tight junctions, desmosomes, and gap junctions join the lateral surfaces of adjacent epithelial cells)
question
Which of the following statements describing cilia is false?
-Cilia contain microtubules
-Cilia increase the apical surface area of an epithelial tissue to maximize transport across the surface membrane
-At the base of each cilium is a centriole, called a basal body
-Cilia produce a propulsive thrust to create the one-way flow of fluid over an epithelial surface
answer
Cilia increase the apical surface area of an epithelial tissue to maximize transport across the surface membrane
(microvilli, not cilia, are extensions of the plasma membrane that increase the apical surface area)
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Which of the following are characteristics of epithelia in general?
-large amount of space between cells
-regenerates poorly
-lacks nerve endings
-specialized contacts
answer
specialized contacts
(specialized contacts are characteristic of epithelia)
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The role of tight junctions is _________.
-to attach actin microfilaments to bind adjacent cells
-intercellular communication
-to prevent molecules from passing between cells
-All of the listed response are correct
answer
to prevent molecules from passing between cells
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How do epithelial tissues receive nutrients?
-from capillaries in underlying connective tissue
-through regeneration of cells
-from the nerves located within epithelial tissues
-through capilaries located in the basal regions of all epithelial tissues
answer
from capillaries in underlying connective tissue
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The major function of stratified squamous epithelium is
-filtration
-absorption
-diffusion
-protection from abrasion
answer
protection from abrasion
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Simple squamous epithelia would not provide
secretion
diffusion
protection from abrasion
filtration
answer
protection from abrasion
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Which of the following is not a characteristic of epithelia?
-innervated
-specialized cell-cell junctions
-highly cellular with little extracellular matrix
-vascular
answer
vascular
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Which of the following provides the least resistance to diffusion?
-stratified squamous epithelium
-simple cuboidal epithelium
-simple squamous epithelium
-simple columnar epithelium
answer
simple squamous epithelium
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A stratified epithelium that thins and flattens as the tissue stretches is a
-stratified squamous epithelium
-transitional epithelium
-pseudostratified epithelium
-stratified cuboidal epithelium
answer
transitional epithelium
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Which one of the following basic types of tissues functions as a covering tissue for the body?
epithelial
connective
muscle
nervous
answer
epithelial
