Question

multiple choice question osteoblasts form special membrane - bound sacs that contain hydroxyapatite crystals. these act as seeds that stimulate hydroxyapatite formation and mineralization of the matrix. what are these membrane sacs called? o hydroxyapatite vesicles o osteoblast vesicles o calcium vesicles o matrix vesicles

Explanation:

Osteoblasts form matrix vesicles which are special membrane - bound sacs containing hydroxyapatite crystals that act as seeds for hydroxyapatite formation.

Answer:

Matrix vesicles