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Osteoblasts are cells that are involved in creating new extracellular matrix in bone.

a. The extracellular matrix of cartilage contains only one type of cell, which are the Chondroblasts.
b. The perichondrium is a structure that surrounds cartilage and contains the Chondrocytes.
c. Bones are continually remodeled, a process that requires that old bone matrix be broken down by Osteoclasts.
d. Lacunae of compact bone are occupied by mature Osteocytes.

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Answer:

(C). Bones are continually remodeled, a process that requires that old bone matrix be broken down by Osteoclasts.

Explanation:

Osteoblasts synthesize and secrete the organic part and inorganic part of the extracellular matrix of collagen fibers and bone tissues. Osteoclasts remove bone structure by releasing lysosomal enzymes and acids that dissolve the bone matrix. These minerals released from the bones into the blood and help regulate calcium concentrations in the body fluids.

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