BSC 109 Lecture Notes - Lecture 9: Nasal Bone, Frontal Bone, Appendicular Skeleton

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Clicker was used to reward the student who attended class. Three types of connective tissue in the skeletal system: bone. Hard elements of the skeleton: ligaments. Provide strength in joints yet enable movement: cartilage. Specialized connective tissue, fibers of collagen and elastic in a gel-like ground substance. Function: support under pressure: types of cartilage, fibrocartilage. Covers and protects ends of long bones in joints, providing protection, reducing friction: elastic cartilage. Bones are the hard elements of the skeleton. Bones have five important functions: support, protection, movement, blood cell formation, mineral storage. Bone: hard inorganic matrix of calcium salts. Compact bone: forms shaft and ends, contains marrow space: yellow bone marrow (mostly fat) is in the marrow space. Spongy bone: trabeculae form lattice-like support: spaces may contain red bone marrow. Later fetal development: osteoblasts replace cartilage with bone. Childhood: primary and secondary ossification sites formed. Estrogen and testosterone cause replacements of cartilage growth plates with bone.

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