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11 Mar 2010 10:43:41 IST

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Why is blood a connective tissue?

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Why is blood a connective tissue?

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SUNIL KHORWAL

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Joined: 23 Feb 2010

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11 Mar 2010 11:31:47 IST

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"Main Entry: connective tissueFunction: noun: a tissue of mesodermal origin that consists of various cells (as fibroblasts and macrophages) and interlacing protein fibers (as of collagen) embedded in a chiefly carbohydrate ground substance, that supports, ensheathes, and binds together other tissues, and that includes loose and dense forms (as adipose tissue, tendons, ligaments, and aponeuroses) and specialized forms (as cartilage and bone)" Merriam-Webster OnLine, www.m-w.com, my favourite dictionary.If you understand that... Ok, I don't know if blood is of mesodermal origin (mesoderm, again according to M-W online, is "the middle of the three primary germ layers of an embryo that is the source of many bodily tissues and structures (as bone, muscle, connective tissue, and dermis)"), but some other characteristics fit it well. It does consist of various cells (red blood cells, all sorts of white blood cells, thrombocytes), and an array of different proteins (though fibrins only form interlacing fibres during clotting, but this can be seen as a form of specialisation for transport - if there were protein fibres around in blood all the time, it could be pretty difficult for RBCs and other cellular stuff to move in it).

edison

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Joined: 19 Oct 2006

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31 Jan 2011 17:26:20 IST

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As the name implies, connective tissue serves a "connecting" function. It supports and binds other tissues. Unlike epithelial tissue, connective tissue typically has cells scattered throughout an extracellular matrix.

Loose Connective Tissue

In vertebrates, the most common type of connective tissue is loose connective tissue. It holds organs in place and attaches epithelial tissue to other underlying tissues.

Loose connective tissue is named based on the "weave" and type of its constituent fibers. There are three main types:

Collagenous Fibers

Collagenous fibers are made of collagen and consist of bundles of fibrils that are coils of collagen molecules.

Elastic Fibers

Elastic fibers are made of elastin and are stretchable.

Reticular Fibers

Reticular fibers join connective tissues to other tissues.

Fibrous Connective Tissue

Another type of connective tissue is fibrous connective tissue which is found in tendons and ligaments. Fibrous connective tissue is composed of large amounts of closely packed collagenous fibers.

Specialized Connective Tissues

Adipose

Adipose tissue is a form of loose connective tissue that stores fat.

Cartilage

Cartilage is a form of fibrous connective tissue that is composed of closely packed collagenous fibers in a rubbery gelatinous substance called chondrin. The skeletons of sharks and human embryos are composed of cartilage. Cartilage also provides flexible support for certain structures in adult humans including the nose, trachea and ears.

Bone

Bone is a type of mineralized connective tissue that contains collagen and calcium phosphate, a mineral crystal. Calcium phosphate gives bone its firmness.

Blood

Interestingly enough, blood is considered to be a type of connective tissue. Even though it has a different function in comparison to other connective tissues it does have an extracellular matrix. The matrix is the plasma and erythrocytes, leukocytes and platelets are suspended in the plasma.

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