Question

Arteries are deep seated and have thick walls. How does its dilation affect the uppermost layer of skin i.e epidermal layer during inflammation

Answer 1

At the inflammatory site the damaged tissue secretes cytokines (chemicals that attract WBC) Mast cell reach there and cause vasodilation (Vessels dilate) & causes blood plasma to accumulate there, which is seen as swelling. Redness is due to the vasodilation, increased blood supply, to that area.