Multiple choice Bone cells are called osteoblasts or _____. erythorocytes osteocytes thrombocytes chondrocytes Reveal answer Fill a bubble to check yourself B Correct answer Explanation Osteoblasts are bone-forming cells, and when they become trapped in the matrix they secrete, they are called osteocytes. Erythrocytes are red blood cells, and chondrocytes are cartilage cells.