Tissue & Tissue Types
What is a tissue?
o
A tissue is made up of a large number of cells
that is specialized to perform a specific function.
What is inter-cellular
space in the tissue
o
the spaces between cells are, usually filled
with extracellular fluid
What are main four
types of tissues?
o
Epithelial Tissue
o
Connective Tissue (includes bone and cartilage)
o
Muscle Tissue
o
Nerve Tissue
What are Excitable
Tissues?
o
Muscle and Nerve tissues are called EXCITABLE
TISSUES due to the specialized property of their cell membrane
Why it’s called
Excitable Tissue ?
o
The property of being able to stimulate the cell
membrane to generate and transmit and electrochemical signal
What is Epithelial
Tissue ?
o
Tissues cover the body and linings of tubes and
cavities in the body.
o
The cells usually lie on a basement membrane
o
Cells of this tissue type are closely packed and
therefore intercellular substance is minimal
What are main two types
of epithelial tissues
o
Simple Epithelium – only one layer of cells
o
Stratified Epithelium – Multiple layers
What are main 04 groups
Simple Epithelium tissue based on shape
o
Squamous Epithelium (Pavement) – flat cells (Heart
– Blood & Lymph vessels – Lung Alveoli)
o
Cuboidal Epithelium – cube like cells (Tubules
of the kidney – Some glands)
o
Columnar Epithelium – tall cells (Lining the
organs of the gastro intestinal tract)
o
Ciliated Epithelium – cells with cilia on the
free surface (Respiratory passage, Fallopian tubes)
What are main 02 groups
Stratified Epithelium tissue
o
Stratified Squamous Epithelium (Skin)
o
Transitional Epithelium (bladder)
What is
pseudo-stratified columnar epithelium
o
The tissue cell nuclei are at different levels
in a section they appear stratified but in fact there is only one layer of
cells (Found in the Respiratory Tract)
What are main 04 types
of Connective Tissue? and main function
o
Tissues that provide support, connect or
separate different types of tissues in the body
o
Loose Connective Tissue:
§
Areolar Tissue– under the skin, between muscles
§
Adipose Tissue (Fat): it is specialized but a
loose connective
o
Dense Connective Tissue:
§
Fibrous tissue – In ligaments,
o
Specialized Connective Tissue (Dense):
§
Cartilage
Tissue
§
Bone Tissue
o
Blood and Lymphatic
How Connective tissue
differ from epithelial tissues?
o
cells are spread wide in connective tissue ,and a large amount of
intercellular substance (matrix)
03 Types of cartilage
o
Hyaline cartilage – Provides Flexibility (Nose)
o
Elastic cartilage – Greater Flexibility (Ears)
o
Fibrous cartilage – Strength (intervertebral
Discs)
02 types of bone
tissues
o
Compact Bone – appears solid
o
Cancellous Bone – more spongy in appearance
What are the main 03 Types of Muscle
o
Skeletal Muscle
o
Smooth Muscle
o
Cardiac Muscle
What is Neurons ?
o
Nerve cells are called Neurons
Main parts of neuron
o
Dendrites
o
Axon
o
Nucleus
o
Nerve Ending
o
node of Ranvier
o
myelin sheath
What is Synapse
o
The space between two nerve endings (or a nerve
ending and a nerve cell body)
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