The correct answer is a, collagen. Collagen accounts for more than half of the protein content of tissue. Elastin is a less abundant protein of the dermis. Keratin is found in the epidermis, albumin in the bloodstream, and myelin around nerve cells. The correct answer is e, histamine.
Histamine is made predominantly by the mast cell.
All of the other components are made by fibroblasts. This process is termed neutrophilic margination. Macrophages function best in a basic pH with low oxygen tension. This is a recall question. Collagen type 1 levels increase in the wound during the maturation phase of healing.