There are four main types of tissues in the body: epithelial, connective, muscle, and nervous tissue. Epithelial tissue forms protective barriers and lines body surfaces. Connective tissue provides structure and support. Muscle tissue allows for movement. Nervous tissue controls and coordinates the body through electrical signaling. Each tissue has distinct cell shapes, arrangements, locations in the body, and functions.

1. FOUR TYPES OF ANIMAL
TISSUES

2. EPITHELIAL TISSUE
(COVERING)
 Tightly­joined closely­packed cells
 One side of exposed to air or
internal fluid, other side attached to
a basement membrane
 Covers outside of the body and lines
internal organs and cavities
 Barrier against mechanical injury,
invasive microorganisms, and fluid
loss
 Provides surface for absorption,
excretion and transport of molecules

3. TYPES OF
EPITHELIAL
TISSUE
 Cell shape
 Squamous
 Cuboidal
 Columnar
 Number of cell
layers
 Simple
 Pseudostratified
 Stratified
 RELATE
STRUCTURE TO
FUNCTION!

4. CONNECTIVE TISSUE
(FRAMEWORK)
 Binding and
support of other
tissues
 Large amount of
extracellular
matrix with fewer
cells
 ECM ­ network of
fibers in liquid,
jelly­like or solid
matrix

6. MUSCLE TISSUE  Composed of long cells called
muscle fibers
(MOVEMENT)  Contraction  movement

7. NERVOUS TISSUE
(CONTROL)
 Senses
stimuli and
transmits Axon
nerve
impulses Dendrite
 Single cell Cell body
body with
long
extensions
(axons and
dendrites)

8. Tissue Type Epithelial Connective Muscle Nerve
Cell Shape Flattened, Irregular or round Elongated Cell appendages
cuboidal, branched
columnar
Cell Single  Scattered in In sheets or Isolated or
Arrangement multilayered matrix bundles networked
Location Body covering or Supports other Lining internal Concentrated in
lining organs or organs organs, make brain and spinal
cavities skeletal muscles cord + all over
the body
Surface Feature Cilia, microvilli - - -
of Cells
Matrix Type Basement Varied – protein - -
membrane fibers + liquid,
gelatinous, firm
to calcified
Matrix Amount Minimal Extensive Absent Absent
Unique Feature No direct blood Cartilage has no Can generate Can generate
supply, except for blood supply electrical signals, electrical signal
glands force and
movement