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5. A 57-year-old man receives a sintered titanium oxide implant during total hip arthroplasty following traumatic injury. During the first 6 weeks following surgery, bone ingrowth anneals to the bone-metal interface in both the femur and acetabulum, thus securing the prosthesis in position. Type I collagen secretion in the first stage of matrix formation is mediated by which of the following cell types?

A) Chondroblasts
B) Chondrocytes
C) Endothelial cells
D) Macrophages
E) Osteoblasts
F) Osteoclasts
G) Osteocytes

its A because high yield histology 3rd edition page 52 says that osteoblast secretes osteoid which is unminer bone matrix that consists of proteoglycan,glycoproteins and type1 collagen

its A because high yield histology 3rd edition page 52 says that osteoblast secretes osteoid which is unminer bone matrix that consists of proteoglycan,glycoproteins and type1 collagen

i mean E