Tissues - M2L1 Assignment

4 Main Tissues and Physiology

Epithelial Tissue

Epithelial tissue covers the inside and outside of the body, including organs. It also lines cavities, tubes, ducts, blood vessels, and is the main tissue of glands.

Epithelial tissue has a few main functions;

As Epithelial tissue is the first line of defense, it protects the body, tissues, and organs as they lie underneath. It also regulates through the absorption, excretion, and secretion of chemicals, hormones, and other products produced by ducts, between body cavities and underlying tissues.


Epithelial tissues is the best type for it function and location. Seeing that as the epithelial tissue is the first line of defense, it would only make sense for that to be the outlining, protective layers of such vital functions. If the body didn't have this protective coat, the internal organs and systems would be openly exposed and therefore more probable to come into contact with dangerous pathogens or other harmful substance.

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Connective Tissue

Connective tissue connects, binds, and supports body structures all throughout the body including the nervous system and in between other tissues.


Connective Tissue does not only just connect, bind, and support structures. It also protects and cushions organs and tissues while it also bears weights, stretches, and takes abuse through the Extracellular Matrix. Blood transfers products, Adipose insulates and stores fats, and Bones provide protection and framework for the body. However depending on which kinds of cells and fibers being used, functions can even further be narrowed down to specifics.


Connective Tissue can be broken down into five different types; Bone, Cartilage, Dense Connective, Loose Connective, and blood. These particular types have their own functions, some listed above, that makes up the function and form of all connective tissue.

ie. Bone protects and provides the support, Cartilage stretches and bears the weight. Loose and Dense Connective Tissues help diffuse oxygen, nutrients, as well as waste products, and blood transfers the products.

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Muscle Tissue

Nervous Tissue

Nervous Tissue is made up of neurons which conducts and transmits nerve impulses to and from body organs. Some cells, called the Neuroglia, support, insulate, and protect neurons. While it sends signals throughout the body it is the main tissue of the nervous system which includes the central nervous system and the peripheral nervous system. The main function of the nervous system is to form the communication network in which it send signals all across the tissues. This means the nervous tissue is responsible for sensory input, control of muscles and glands, homeostasis, and mental activity.