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Deposition of bone matrix by osteoblasts and resorption by osteoclasts.

1. Deposition of bone matrix by osteoblasts and resorption by osteoclasts.
2. The wall of blood vessels (arteries & veins) are made up of mainly 3 layers.
3. The outermost tunica externa has a loose connective tissue, collagen fibres, lymph vessels and the middle tunica media has circular smooth muscle fibres.
4. Some elastic fibres and the inner most tunica interna is a single layered endothelium of polyhedral squamous cells.

Correct answer: Deposition of bone matrix by osteoblasts and resorption by osteoclasts.

Solution

Bone is constantly remodeled by two specialized cells: osteoblasts deposit new bone matrix, while osteoclasts resorb old bone. That exact pairing makes the statement correct.

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