BIOL 212 Study Guide - Midterm Guide: Intramembranous Ossification, Hyaline Cartilage, Condyloid Process
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Know the steps to the following, osteogenesis [endochondral and intramembranous] a. i. Hyaline cartilage model -- mesenchyme -> mesenchymal cells differentiate into chondroblasts -> chondroblasts secrete matrix -> chondroblasts become chondrocytes trapped in lacunae -> cartilage model formed, surrounded by perichondrium. > formation of secondary ossification center in epiphysis -> hyaline cartilage remains in the epiphyseal plate [until growth is completed] and on the articular surfaces [for life] a. ii. An impulse for contraction [aka a stimulus, or an action potential] comes down the motor neuron causing ach to be released at the neuromuscular junction. Sarcolemma receives ach and spreads an action potential b. ii. b. iii. Sr releases calcium ions b. iv. b. v. ca2+ binds to proteins on actin exposing the myosin binding sites on actin b. vi. Myosin head breaks atp into adp and inorganic phosphate b. vii. b. viii. and energy. There is a loss of adp and pi [it comes off of it]