Question

write the four characteristics of connective tissue

Answer 1

1.Connective tissue is the most abundant and widely distributed of the primary tissues.
2.Connective tissue has three main components: cells, fibers, and ground substance. Together the ground substance and fibers make up the extracellular matrix.
3.Connective tissue is classified into two subtypes: soft and specialized connective tissue.
4.Major functions of connective tissue include: 1) binding and supporting, 2) protecting, 3) insulating, 4) storing reserve fuel, and 5) transporting substances within the body.Connective tissues can have various levels of vascularity. Cartilage is avascular, while dense connective tissue is poorly vascularized. Others, such as bone, are richly supplied with blood vessels.

Answer 2

Connective tissue (CT) is one of the four main classes of tissues. Although it is the most abundant and widely distributed of the primary tissues, the amount of connective tissue in a particular organ varies. Like to the timber framing of a house, the connective tissue provides structure and support throughout the body.

Structure of Connective Tissue

Connective tissue has three main components:

Ground substanceFibersCells

Together the ground substance and fibres make up the extracellular matrix. The composition of these three elements varies tremendously from one organ to the other. This offers great diversity in the types of connective tissue.

Structural elements of connective tissue: Connective tissues consist of three parts: cells suspended in a ground substance or matrix, and most have fibres running through it.

Ground substance is a clear, colourless, viscous fluid that fills the space between the cells and fibres. It is composed of proteoglycans and cell adhesion proteins that allow the connective tissue to act as glue for the cells to attach to the matrix. The ground substance functions as a molecular sieve for substances to travel between blood capillaries and cells.

Connective tissue fibres provide support. Three types of fibres are found in connective tissue:

CollagenElastic fibersReticular fibres Collagen Fibers

Collagen: Collagen fibres are the strongest and most abundant of all the connective tissue fibres.

Collagen fibres are fibrous proteins and are secreted into the extracellular space and they provide high tensile strength to the matrix.

Elastic Fibers

Elastic fibres are long, thin fibres that form branching network in the extracellular matrix. They help the connective tissue to stretch and recoil.

Reticular Fibers

Reticular fibres are short, fine collagenous fibres that can branch extensively to form a delicate network.

Function of Connective Tissue

The major functions of connective tissue include:

Binding and supporting.Protecting.Insulating.Storing reserve fuel.Transporting substances within the body. Types of Connective Tissue

Connective tissues encompass a diverse array of tissue types that are involved in binding and supporting body structure and tissues.

Connective tissue is divided into four main categories:

Connective properCartilageBoneBlood

Connective tissue proper has two subclasses: loose and dense. Loose connective tissue is divided into 1) areolar, 2) adipose, 3)
reticular. Dense connective tissue is divided into 1) dense regular, 2) dense irregular, 3) elastic.

Areolar Connective Tissue

These tissues are widely distributed and serve as a universal packing material between other tissues. The functions of areolar connective tissue include the support and binding of other tissues.

It also helps in defending against infection. When a body region is inflamed, the areolar tissue in the area soaks up the excess fluid as a sponge and the affected area swells and becomes puffy, a condition called edema.

Adipose Tissue or Body Fat

Adipose tissue: Yellow adipose tissue in paraffin section with lipids washed out.

This is loose connective tissue composed of adipocytes. It is technically composed of roughly only 80% fat. Its main role is to store energy in the form of lipids, although it also cushions and insulates the body.

The two types of adipose tissue are white adipose tissue (WAT) and brown adipose tissue (BAT). Adipose tissue is found in specific locations, referred to as adipose depots.

Reticular Connective Tissue

This tissue resembles areolar connective tissue, but the only fibers in its matrix are the reticular fibers, which form a delicate network. The reticular tissue is limited to certain sites in the body, such as internal frameworks that can support lymph nodes, spleen, and bone marrow.

Dense Regular Connective Tissue

This consists of closely packed bundles of collagen fibers running in the same direction. These collagen fibers are slightly wavy and can stretch a little bit.

With the tensile strength of collagen, this tissue forms tendons, aponeurosis and ligaments. This tissue forms the fascia, which is a fibrous membrane that wraps around the muscles, blood vessels, and nerves.

Dense Irregular Tissue

This has the same structural elements as dense regular tissue, but the bundles of collagen fibers are much thicker and arranged irregularly. This tissue is found in areas where tension is exerted from many different directions. It is part of the skin dermis area and in the joint capsules of the limbs.

Elastic Connective Tissue

The main fibers that form this tissue are elastic in nature. These fibers allow the tissues to recoil after stretching. This is especially seen in the arterial blood vessels and walls of the bronchial tubes.

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