Bone Physiology and Metabolism and Related Disorders PDF

# Myofibrils Consist of Thick Filaments and Thin Filaments - The **sarcoplasm** contains many of the organelles found in the cytoplasm of other cells, such as nuclei, golgi apparatuses, ribosomes, and mitochondria - However, ~80% of the volume of the sarcoplasm is devoted to the rod-like **myofibri...

# Myofibrils Consist of Thick Filaments and Thin Filaments - The **sarcoplasm** contains many of the organelles found in the cytoplasm of other cells, such as nuclei, golgi apparatuses, ribosomes, and mitochondria - However, ~80% of the volume of the sarcoplasm is devoted to the rod-like **myofibrils** (~1 um diameter), bundled in parallel and running the entire length of the cell - The myofibrils consist of **thick filaments** and **thin filaments** - The myofibrils represent the contractile machinery of skeletal muscle (and cardiac muscle too; but not smooth muscle, as we will find out).