UNIT 2 - Human Physiology
Assignment 1 - THE STRUCTURE AND FUNCTIONS OF BODY TISSUES
Histology is the name for the study of tissues. A tissue is a group of cells which forms a specialised function. There are
many different types of tissue and one type of tissue may be found in many parts of the body.
In the body we have four main types of tissue which are:
* Epithelial
* Connective
* Muscle
* Nervous
All these different types of tissue are needed in order for the body to function. All of these tissues have different
characteristics and functions.
The first type of tissue to look at is: Epithelial Tissue
There are 6 main types of epithelial tissue:
* Squamous epithelium
* Cubodial epithelium
* Columnar epithelium
* Ciliated epithelium
* Compound transitional epithelium
* Glandular epithelium
Squamous Epithelium
Simple squamous
These are usually made up of thin flat scale like cells, which rest on the basement of the membrane. This type of tissue can
be found in renal capsules of the kidneys, alveoli of the lungs and blood capillary walls. They are usually found in these
areas as the thinness of the cells allows diffusion of materials through them. Therefore the main functions are to reduce
friction, and to perform absorption and secretion.
Stratified squamous
Stratified squamous are made up of several layers of cells. They are like simple sqarmous cells in shape only more
compact. This compact structure adds more protection to the tissue as it is mainly found where chemical stresses are most
severe. These cells provide protection against abrasion and chemical attacks as the lining sufaces are involved in the
transport of gases and fluids. Stratified sqamous are found in the mouth, throat and oesophagus.
Cubodial Epithelium
Simple cubodial
Cubodial epithelium is made up of cube shaped cells with their nuclei are near to the centre of each cell. Cuboidal
epithelium is located in glands, ducts, portions of kidney tubes and the thyroid glands. This cuboidal tissue offers very little
protection, however they secrete enzymes and line some areas of the ducts that discharge such secretions and offer some
form of absorbsion.
Stratified cuboidal epithelium
This type of cell is quite rare and consists of 2 or 3 layers of cube like cells only they are more compact than simple
cubiodal epithilium. As they are more compact they are able to withstand more wear and tear. They can usually be found
lining larger excretory ducts like the sweat glands and the pancreas. However stratified cubodial epithelium doesn't have an
absorptitive or secretory function yet contains a more robust lining.
Assignment 1 - THE STRUCTURE AND FUNCTIONS OF BODY TISSUES
Histology is the name for the study of tissues. A tissue is a group of cells which forms a specialised function. There are
many different types of tissue and one type of tissue may be found in many parts of the body.
In the body we have four main types of tissue which are:
* Epithelial
* Connective
* Muscle
* Nervous
All these different types of tissue are needed in order for the body to function. All of these tissues have different
characteristics and functions.
The first type of tissue to look at is: Epithelial Tissue
There are 6 main types of epithelial tissue:
* Squamous epithelium
* Cubodial epithelium
* Columnar epithelium
* Ciliated epithelium
* Compound transitional epithelium
* Glandular epithelium
Squamous Epithelium
Simple squamous
These are usually made up of thin flat scale like cells, which rest on the basement of the membrane. This type of tissue can
be found in renal capsules of the kidneys, alveoli of the lungs and blood capillary walls. They are usually found in these
areas as the thinness of the cells allows diffusion of materials through them. Therefore the main functions are to reduce
friction, and to perform absorption and secretion.
Stratified squamous
Stratified squamous are made up of several layers of cells. They are like simple sqarmous cells in shape only more
compact. This compact structure adds more protection to the tissue as it is mainly found where chemical stresses are most
severe. These cells provide protection against abrasion and chemical attacks as the lining sufaces are involved in the
transport of gases and fluids. Stratified sqamous are found in the mouth, throat and oesophagus.
Cubodial Epithelium
Simple cubodial
Cubodial epithelium is made up of cube shaped cells with their nuclei are near to the centre of each cell. Cuboidal
epithelium is located in glands, ducts, portions of kidney tubes and the thyroid glands. This cuboidal tissue offers very little
protection, however they secrete enzymes and line some areas of the ducts that discharge such secretions and offer some
form of absorbsion.
Stratified cuboidal epithelium
This type of cell is quite rare and consists of 2 or 3 layers of cube like cells only they are more compact than simple
cubiodal epithilium. As they are more compact they are able to withstand more wear and tear. They can usually be found
lining larger excretory ducts like the sweat glands and the pancreas. However stratified cubodial epithelium doesn't have an
absorptitive or secretory function yet contains a more robust lining.
