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Question 24 2 / 2 pts What substance from the blood accumulates to form a clot? White blood cells Red blood cells Correct! Platelets Macrophages Question 25 2 / 2 pts Mast cells secrete what chemical? Collagen Correct! Histamine Platelets Heparin Question 26 2 / 2 pts Macrophages secrete histamine. remove fibroblasts. Correct! engulf bacteria. replace old tissue matrix. Question 27 2 / 2 pts A scar . is called clotting. maintains full function of the original tissue. Correct! is an overgrowth of fibrous connective tissue. supports the tissue matrix until the old cells are developed.