1
2.5 : Cells are grouped into tissues
(A) Animal
CELL STRUCTURE & FUNCTION
CELL STRUCTURE AND FUNCTIONS
Prokaryotic and eukaryotic cells
Microscopic structures of plant and animal
cell
Structures & functions:Cell membrane and
organelles
Cell transport
Cells are grouped into tissue
Animal Plant
Epithelial Nerve Muscle Connective
MeristemParenchymaCollenchymaSclerenchyma Xylem Phloem
Types&
Specialized cell
From a ball of cells (embryo)
Nerve cells
osteocytes Blood cells
Muscle cells
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cell
tissue
organ
system An integrated group of cell with
a common structure,
function, or both.
Types of tissues
epithelial
muscle
nerve
connective
Striated muscle
Smooth muscle
Cardiac muscle Bonecartilage blood
squamous
cuboidal
columnar
At the end of this lesson, student should be able to:
Describe the structure, distribution and function of the following cell:
a) Epithelial
b) Nerve
Simplesttissues.
It can be built up into tissues of varying complexity.
Lining tissues : in it simplest form, it consists of a single layer of cells covering the surface of the body and the organs within it.
A) Epithelial Tissues
Also lines various spaces and tubes ( in which situation it is usually referred to as endothelium).
Firmly attached to each other.
Rest on basement membrane
Have free surface
A) Epithelial Tissues
basement membrane
A) Epithelial Tissues
MAIN FUNCTION Protection
OTHER FUNCTIONS
To increase the surface area for absorptionof material
Exchange materials by diffusion
As a gland ; secrete mucus and enzyme
TYPES EPITHELIAL
Cell
Shape
SIMPLE
- single layer of cells
STRATIFIED
- multiple layers of cells
PSEUDO-STRATIFIED
-single layer but it appears to be stratified because the cells vary in length
SQUAMOUS
CUBOIDAL
COLUMNAR
TYPES OF EPITHELIAL TISSUES
Simple EpithelialTissues
Stratified EpithelialTissues
PseudostratifiedEpithelialTissues
Simple squamousEpithelial tissues
Simple cuboidalEpithelial tissues
Simple columnarEpithelial tissues
Stratified squamousEpithelial tissues
Stratified columnar
Epithelial tissues
i) Simple Squamous Epithelial tissues
Cells are flattened
The sheet of cell is delicate, thin , and leaky
basement membrane