Tissues

Question 1

Cells work together in functional group called

Answer 1

Tissues

Question 2

How many types of tissues

Answer 2

4 type of Tissues

Question 3

Epithelial tissue

Answer 3

Covers a body surface or lines a body cavity

Question 4

Function of epithelial tissue

Answer 4

Protection
Absorption & Secretion
Filtration
Forms slippery surf

Question 5

Factors holding epithelial cells together

Answer 5

Adhesion proteins link plasma membranes of
adjacent cells
 Contours of adjacent cell membranes
 Special cell junctions
◼ Tight Junctions
◼ Gap Junctions
◼ Desmosomes

Question 6

Classifications & Naming of Epithelia

Answer 6

First name of tissue indicates number of
layers
 Simple– one layer of cells
 Stratified– more than one
layer of cell

Last name of tissue describes shape of
cells
 Squamous– cells wider
than tall (plate or “scale” like)
 Cuboidal– cells are as wide
as tall, as in cubes
Columnar– cells are taller than
they are wide, like colu

Question 7

Tight junctions

Answer 7

close off intercellular
space

Found at apical region of most epithelial types

Question 8

Desmosomes

Answer 8

two disc-like plaques
connected across intercellular space

Plaques of adjoining cells are joined by
proteins called cadherins

Question 9

Gap junctions

Answer 9

– passageway between two
adjacent cells

Let small molecules move directly between
neighboring cells

Question 10

Simple Squamous Epithelium

Answer 10

 single layer of flat cells with disc shaped nuclei

Passage of materials by passive diffusion and
filtration
 Secretes lubricating substances in serosae

Question 11

Simple Cuboidal Epithelium

Answer 11

single layer of cube-like cells with large, spherical central nuclei

 secretion and absorption

Question 12

Simple Columnar Epithelium

Answer 12

single layer of column-shaped (rectangular)
cells with oval nuclei
◼ Some bear cilia at their apical surface
◼ May contain goblet cells

Question 13

Simple Columnar Epithelium

Answer 13

Non-ciliated form
◼ Lines digestive tract,
gallbladder, ducts of
some glands

Question 14

Pseudostratified Columnar Epithelium

Answer 14

All cells originate at basement membrane
 Only tall cells reach the apical surface
 May contain goblet cells and bear cilia
 Nuclei lie at varying heights within cells
◼ Gives false impression of stratificat

Question 15

Stratified Epithelia

Answer 15

Contain two or more layers of cells
◼ Regenerate from below
◼ Major role is protection
◼ Are named according to the shape of cells
at apical laye

Question 16

Stratified Squamous Epithelium

Answer 16

Many layers of cells – squamous in shape
 Deeper layers of cells appear cuboidal or
columnar
 Thickest epithelial tissue – adapted for protection

Question 17

Glandular Epithelium

Answer 17

Ducts carry products of exocrine glands to
epithelial surface

Question 18

Unicellular Exocrine Glands
(The Goblet Cell)

Answer 18

◼ Goblet cells produce
mucin
◼ Mucin + water →
mucus
◼ Protects and lubricates
many internal body
surfaces

Question 19

Multicellular Exocrine Glands

Answer 19

Classified by structure (branching
& shape) of duct
◼ Can also be classified by mode or
type of secretion

Question 20

Connective Tissue

Answer 20

Most diverse and abundant tissue
◼ Main classes
 Connective tissue proper
 Blood – Fluid connective tissue
 Cartilage
Supporting connective tissues Bone tissue

Question 21

Connective Tissue Proper -
Classifications

Answer 21

Loose Connective Tissue
◼ Dense Connective Tissue
◼ Adipose Tissue
◼ Cartilage
◼ Bone
◼ Blood

Question 22

Muscle Tissue

Answer 22

◼Types
Skeletal muscle tissue
Smooth muscle tissue
Cardiac muscle tissue

Question 23

Skeletal Muscle Tissue

Answer 23

Characteristics
 Long, cylindrical cells
 Multinucleate
 Obvious striations
◼ Function
 Voluntary movement
 Manipulation of
environment
 Facial expression

Question 24

Smooth Muscle Tissue

Answer 24

◼ Characteristics
 Spindle-shaped cells with
central nuclei
 Arranged closely to form
sheets
 No striations
◼ Function
 Propels substances along
internal passageways
 Involuntary control

Question 25

Cardiac Muscle Tissue

Answer 25

Function
 Contracts to propel blood into circulatory system
◼ Characteristics
 Branching cells
 Uni-nucleate
 Intercalated discs

Question 26

Nervous Tissue

Answer 26

Function
 Transmit electrical signals from sensory receptors to
effectors
◼ Location
 Brain, spinal cord, and nerves