Which is incorrest for dense irregular connective tissue? (1) Cells and fibres oriented differently (2) Present in skin (3) Mostly elastic fibres are present (4) Fibroblast cells are present Correct answer is( 3).Can u explain?

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Answer

Dense connective tissue, also called dense fibrous tissue, is a type of connective tissue with fibers as its main matrix element.The fibers are mainly composed of type I collagen. Crowded between the collagen fibers are rows of fibroblasts, fiber-forming cells, that generate the fibers. Dense connective tissue forms strong, rope-like structures such as tendons and ligaments. Tendons attach skeletal muscles to bones; ligaments connect bones to bones at joints. Ligaments are more stretchy and contain more elastic fibers than tendons. Dense connective tissue also make up the lower layers of the skin (dermis), where it is arranged in sheets.

Answer

Dense irregular connective tissue is a type of connective tissue found in various parts of the body, including the skin, organs, and joints. It is characterized by its dense arrangement of collagen fibers and its irregular orientation of cells and fibers. However, the statement that 'mostly elastic fibers are present' is incorrect. In dense irregular connective tissue, elastic fibers are not the predominant type of fibers present.

Here is a detailed explanation:

Dense Irregular Connective Tissue
Dense irregular connective tissue is composed of collagen fibers, elastic fibers, and various types of cells, including fibroblasts, macrophages, and adipocytes. It is called 'dense' due to its high concentration of collagen fibers and 'irregular' because the fibers and cells are oriented in different directions, unlike the parallel arrangement found in dense regular connective tissue.

Orientation of Cells and Fibers
In dense irregular connective tissue, the collagen fibers are arranged in a random and haphazard manner. This irregular arrangement provides strength, support, and resistance to tensile forces from different directions. The cells, mainly fibroblasts, are dispersed throughout the tissue and are responsible for synthesizing and maintaining the extracellular matrix, which includes the collagen and elastic fibers.

Predominant Fibers
The most abundant fibers in dense irregular connective tissue are collagen fibers. Collagen is a strong and flexible protein that provides tensile strength and structural support to the tissue. These collagen fibers are arranged in different orientations, forming a mesh-like network that helps resist pulling forces from various directions.

Elastic Fibers
While elastic fibers are present in dense irregular connective tissue, they are not the predominant type of fibers. Elastic fibers are composed of the protein elastin, which allows the tissue to stretch and recoil. Elastic fibers provide elasticity and resilience to the tissue. However, in dense irregular connective tissue, collagen fibers outnumber elastic fibers.

Conclusion
In summary, dense irregular connective tissue is characterized by its dense arrangement of collagen fibers and irregular orientation of cells and fibers. The statement that 'mostly elastic fibers are present' is incorrect because elastic fibers are not the predominant type of fibers in this tissue. Collagen fibers are the main component of dense irregular connective tissue, providing strength and support to the tissue.

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