MECH2901 Lecture Notes - Lecture 1: Parathyroid Gland, Homeostasis, Multinucleate

• School: University of Sydney
• Department: Mechanical Engineering
• Course: MECH2901
• Professor: A/Prof Colin Dunstan

Document Summary

Lecture 1: skeletal system: bones and bone tissue. Support: bone is hard and rigid; cartilage is flexible yet strong. Cartilage in nose, external ear, thoracic cage and trachea. Protection: skull around brain; ribs, sternum, vertebrae protect organs of thoracic cavity. Movement: produced by muscles on bones, via tendons. Ligaments allow some movement between bones but prevent excessive movement. Absorb shock: impacts during motion need to be absorbed to reduce strain on bone and joints and damage to soft tissues. Blood cell production: bone provides a niche for bone marrow that gives rise to blood cells and platelets. Epiphysis: end of the bone, cancellous bone. Epiphyseal plate: growth plate: hyaline cartilage; present until growth stops. Epiphyseal line: bone stops growing in length. Medullary cavity: in children medullary cavity is red marrow, gradually changes to yellow in limb bones and skull (except for epiphyses of long bone). Trabeculae: interconnecting rods or plates of bone.