Collagen fibres are secreted by

A) Mast cells

B) Macrophage

C) Histiocytes

D) Fibroblasts

Option A – Mast Cells:

Mast cells are immune cells derived from myeloblasts. They release histamine, which aids in wound healing and the formation of new blood vessels. However, they do not secrete collagen fibers.

Option A is incorrect.

Option B – Macrophages:

Macrophages originate from monocytes. These are large white blood cells that play a key role in immunity by removing foreign particles through phagocytosis. They do not secrete collagen fibers.

Option B is incorrect.

Option C – Histiocytes:

Histiocytes are tissue-resident macrophages involved in tissue repair and regulation of inflammatory responses. Like other macrophages, they do not secrete collagen fibers.

 Option C is incorrect.

Option D – Fibroblasts:

Fibroblasts are the cells responsible for secreting collagen fibers, which provide structural support to tissues. They also help in producing the extracellular matrix and play a crucial role in wound healing.

Option D is correct.