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Connective tissue

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===Dense Irregular Connective Tissue===
===Dense Irregular Connective Tissue===
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Dense irregular connective tissue is called such because of its abundance of collagen fibers. In comparison to loose connective tissue, it has significantly more collagen fibers than the former. The term “irregular” in the name simply states that the fibers are oriented in assorted directions. Because of this, it has strength in all directions. Because of its durability, dense irregular connective tissue is found in a multitude of places in the body.  It forms capsules around organs such as kidneys. It is also found in the dermis, giving skin the tough durability required to make it an effective shield for the body. (Book p.47-48)
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===Dense Regular Connective Tissue===
===Dense Regular Connective Tissue===

Revision as of 04:10, 11 May 2010

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Contents

Introduction

Connective tissues form the body’s infrastructure. Its cells emit a number of products externally. Therefore, the cells are all somewhat far apart with a great deal of extracellular material between them. This extracellular material located between the connective tissues and called extracellular matrix. It contains a mixture of chemicals referred to as the ground substance. The ground substance is composed of special proteins that the cells secrete to attract water. This accumulation of water makes the ground substance gel-like. Many of the cells in connective tissue also secrete proteins that from fibers, called protein threads. Collagen is an example of protein fiber that aids in holding connective tissue together, making it firm. (Book p.45-46)

Connective tissue is classified based upon the characteristics of its extracellular matrix. It can be classified into four basic types: connective tissue proper, cartilage, bone, and blood. (Book p.46) Connective tissue serves a role in structural support, metabolic functions, and defense. The most prominent function is structural support. Some connective tissues form capsules which envelop organs. Tendons and ligaments which connect muscle to bone and bone to bone, are other examples of connective tissue actively supporting the structures of the body. Connective tissues also serve a nutritive role in the body. Different metabolites diffuse through connective tissue membranes during their process of travel to or from blood capillaries from or to cells and tissues. Adipose tissue, specifically, stores energy and serves as thermal insulation. It is also in the adipose tissue that excess calories can be converted into lipids and stored in adipocytes until they are utilized. Connective tissues house specific cells called macrophages, which are grouped as part of the Mononuclear Phagocyte System of the body. These macrophages assist in tissue repair and defend against bacterial invasion. Fibroblasts in some connective tissue form in response to injury and form fibrous scar tissue. (http://www.technion.ac.il/~mdcourse/274203/lect3.html)

Connective Tissue Proper

Main Article: Connective Tissue Proper

Loose Connective Tissue

Loose connective tissue proper is characterized by its gel-like ground substance. It is composed of proteins, including collagen; some fluid; and elastic fibers. All of these components which form the extracellular matrix of loose connective tissue proper are produced by cells. The cells that specifically make up connective tissue are called fibroblasts. Technically, one of these cells is only called a fibroblast while the tissue is developing. Once the fibroblast is fully mature, displayed by being completely surrounded by the matrix, it is called a fibrocyte. (Book p.47)

The task of light connective tissue is to form a light binding. It is not extremely strong, but instead highly flexible. This lets the connective tissue hold things together in all directions, but very subtly. The most recognizable function of loose connective tissue is to connect the skin to the underlying muscle. (Book p.47)

Adipose Tissue

In Layman’s terms, adipose tissue is referred to as fatty tissue. It contains the components of loose connective tissue: fluids and proteins, such as collagen and those used to make up elastic fibers; with the addition of fat cells. (Book p.49) The functions of adipose tissue include providing insulation and storing energy. There are two types of adipose tissue; white adipose tissue, and brown adipose tissue. White adipose tissue functions as heat insulation, mechanical cushion, and a source of energy. More energy can be stored per gram of fat than either per gram of carbohydrate or protein. Therefore, storing energy as fat is the most space effective form of energy storage in the body. Brown adipose tissue releases stored energy directly as heat. (http://www.sportsci.org/encyc/adipose/adipose.html) Because fat is so effective at insulating and producing heat, it is healthy to have fat; as long as it is in the proper quantity in relation to a person’s mass. Adipose tissue can be found serving as a cushion surrounding organs such as the kidneys, and as insulation in places such as under the skin. (Book p.49)

Dense Irregular Connective Tissue

Dense irregular connective tissue is called such because of its abundance of collagen fibers. In comparison to loose connective tissue, it has significantly more collagen fibers than the former. The term “irregular” in the name simply states that the fibers are oriented in assorted directions. Because of this, it has strength in all directions. Because of its durability, dense irregular connective tissue is found in a multitude of places in the body. It forms capsules around organs such as kidneys. It is also found in the dermis, giving skin the tough durability required to make it an effective shield for the body. (Book p.47-48)

Dense Regular Connective Tissue

Cartilage

Main Article: Cartilage

Hyaline Cartilage

Elastic Cartilage

Fibrocartilage

Bone

Main Article: Bone

Osseous Tissue

Blood

Main Article: Blood

Vascular Tissue

References


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