BIO 203 Lecture Notes - Lecture 22: Bone Marrow, Phosphate, Chondrocyte
14 Dec 2016
School
Department
Course
Professor
Document Summary
Chondrocyte: cartilage cells that secrete extracellular matrix scaffold for bone to grow on. Osteoblast: cells that take calcium and inorganic phosphate from plasma and use it to build bone. Osteoclasts: cells that remove calcium and inorganic phosphate from bone and deposit it in plasma. Osteocyte: mature, inactive osteoblasts found in bones that have stopped lengthening. Bones start out as cartilage in a fetus. Growth continues at the ends of long bones in areas known as epiphyseal plates until the end of puberty. Epiphyseal closure occur when bones stop growing. Bone growth may be restarted after injury. Mesenchyme, cartilage, hypertrophic chondrocytes, hypertrophic chondrocytes, osteoblasts, blood vessels, proliferating chondrocytes. Bone marrow forms in the spaces between the mineralized bones. Unequal divisions produce one sc and one cell that goes o to become a specific type of cell. Differentiation= the process of activating a select set of genes to produce gene products found in only a certain mature cell type.
