Unit 5 Tissues

Topics: Muscle, Connective tissue, Tissues Pages: 45 (1068 words) Published: July 1, 2015
Unit 5: Anatomy
and Physiology
Topic: Types of
tissues
Date: 09/06/2015

Objectives :
Exploring four types of tissues. 
and
 Comparing four types of tissues :
 Nervous,
 Connective
 Epithelial,
 and muscular tissues.  


From Tissues to organs
Cells combine to form tissues and tissues
combine to form organs.
 Cells combine to form four primary tissues:
- Epithelial tissue
- Connective tissue
- Muscle tissue
- Nerve tissue


 BACKGROUND:A

tissue is a group
of cells that have a similar shape
and function.  Different types of
tissues can be found in different
organs.  In humans, there are four
basic types of tissue:  epithelial,
connective, muscular, and nervous
tissue.  There may be various subtissues within each of the primary tissues.  

Activity:
In pairs discuss the types of tissues found in
human body
 What idea do you develop of their functions
in body?


Epithelial Tissue
Epithelial tissue covers the body surface and
forms the lining for most internal cavities.
There are two kinds of epithelial tissues:
 Covering and lining epithelium covers or lines
almost all of your internal and external body
surfaces; for example, the outermost layer of your
skin and other organs, and the internal surface
lining of your lymph vessels and digestive tract.
 Glandular epithelium secretes hormones or other
products such as stomach acid, sweat, saliva, and
milk.


Function and shapes of
epithelial tissue:


The major function of epithelial tissue
includes protection, secretion, absorption,
and filtration.  The skin is an organ made up
of epithelial tissue which protects the body
from dirt, dust, bacteria and other microbes
that may be harmful.   Cells of the epithelial
tissue have different shapes. Cells can be:
-thin
-flat
-cubic
elongated.  

Functions of Epithelial
tissues:
I. EPITHELIUM
Functions (jobs):
 1) It protects us from the outside world –
skin.
 2) Absorbs – stomach and intestinal lining
(gut)
 3) Filters – the kidney
 4) Secretes – forms glands

Epithelium-Human Stomach

Classification of epithelial
tissues:
Classifications (types):
1) By shape
 a) squamous - flat and scale-like
 b) cuboidal - as tall as they are wide
 c) columnar - tall, column-shaped

Classification-continued:
2) By cell arrangement
 a)

simple epithelium - single layer of
cells (usually for absorption and
filtration)
 b) stratified epithelium - stacked up
call layers (protection from abrasion
(rubbing) - mouth, skin.)

• Figure 4.4

Activity
In pairs discuss and write the :
 Definition of tissue
 Types of tissues
 Where in human body epithelial
tissues are located?

Connective tissue
Connective tissue is the most abundant
and the most widely distributed of the
tissues. 
Function:
 Connective tissues perform a variety of
functions including support and
protection. 


Types and examples of
connective tissue:
The following tissues are found in the human
body
 ordinary loose connective tissue
 fat tissue
 dense fibrous tissue
 cartilage
 bone
 Blood
 and lymph, which are all considered
connective tissue.  

Areolar tissue



Areolar tissue has no specific pattern or structure.
It is made up of cells and extra cellular
matrix(extracellular is material out side of the
cells).

Matrix has two components,
fibres and ground substance.
 In this image you can see the fibres like threads.


Connective tissue:
Functions:


1) Wraps around and cushions and

protects organs
 2) Stores nutrients
 3) Internal support for organs
 4) As tendon and ligaments protects
joints and attached muscles to bone
and each other

SPECIAL CONNECTIVE TISSUES

1) Cartilage
 Functions (jobs):
 1) provides strength with flexibility
while resisting wear, i.e. epiglottis,
external ear, larynx
 2) cushions and shock absorbs where
bones meet, i.e....
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