Epithelial tissues

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Human cell viewed under a light microscope (A)

(bio1151.nicerweb.com/class04.html)

Human cell viewed under an electron microscope (B)

(bio1151.nicerweb.com/class04.html)

Compare the cell diagrams you have provided for parts a) and b) and state the differences observed with reference to the components viewed in both illustrations.

Large organelles found within cells can be seen under a light microscope

such organelles that can be seen are: the cell wall, Mitochondria, nucleus,

plasma cell membrane, golgi apparatus and cytoplasm

The light microscope however, has limitations in terms of resolution for

example because the magnification can only go up to a certain magnification,

a number of smaller organelles within a cell cannot be seen as a light

microscope is not as strong as an electron microscope where you can get

more detailed images due to it having a stronger magnification resolution.

Even if a light microscope had greater powers of magnification, not much

detail would be seen due to lack of resolution by light rays. Electron

microscopy has great power of resolution and can magnify up to 500,000

times therefore resulting in a more detailed and defined outcome.

As you can see in diagram A the image is in much simpler version than the

one in diagram B.In diagram A you can see the main large organelles which

include the mitrochondrion,nucleus,cytoplasm,chromatin,golgi apparatus and

nuclear membrane. Diagram B shows many of the same structures that we

can see in diagram A but in much more detail for example in diagram A we

can only see a round image of a Nucleus but if we look at the electron

microscopy then we will find that it's not a complete circle at all, but actually

has little gaps in-between the nucleus envelope known as the nucleus pores.

going all around the nucleus. Diagram B Includes, more structures that we

can't see in diagram A. In diagram A small structures are difficult to identify for

example in Diagram A the structure labelled X could be mitochondria,

secretary granules, lyosomes, vacuoles etc,it is not detailed therefore cannot

really state what it actually is, unless viewed under an electron microscope.

Explain the term "Tissue", providing at least two examples of tissues from the human body.

What does the term "Tissue" mean?

A tissue is defined as a group of similar cells working together to perform a

specific function.

(http://training.dictionary.cancer.gov/module_anatomy/unit2_2_body_tissues.html)

Two examples of tissues found in the human body are:

Cardiac Muscle Tissue, which is located only in the heart and is responsible

for moving the blood and maintaining the blood pressure.

Connective tissues which are responsible for the form and shape of the

animal/human body and, in addition, provide protection for vital organs and

facilitate locomotion. Examples of Connective tissues found in the body are

the inner layers of skin, tendons, ligaments, cartilage, bone and fat tissue.

Membranes are sheets of tissue that cover, line surfaces, separate organs or

parts of organs from each other

List the main tissue types found within the human body.

There are four main types of tissue found within the human body, they are:

* Epithelial tissue

* Connective tissue
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* Muscle tissue and

* Nervous tissue

Describe briefly each of the main tissue types found in the human body. (Your descriptions should include types of tissue found within each main category, relevant illustrations, information regarding their structure, location within the body and function(s)).

Epithelial tissues

Epithelial tissues are membranous tissues covering internal organs and

other internal surfaces of the body, to help keep the body's organs separate,

in place and protected. Some examples of epithelial tissue are the outer layer

of the skin, the inside of the ...

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