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AH 112: Skeleton

Study materials for the skeletal system unit

How many bones does the human body contain? 206 bones
What does "axial skeleton" mean? It refers to the 80 bones that lie on the axial line (the central line) of the body
What does "appendicular skeleton" mean? It refers to the 126 bones found in the limbs of the body
Where is the mandible bone located? The jaw
What are animals with backbones called? Vertebrates
What four things make up the skeletal system? Bones, cartilage, ligaments, tendons
Bones and muscle function as ____ to produce body movement. A simple mechanical lever
Bones contain more of this than any other organ. Calcium
What is the formation of blood cells called? Hematopoiesis
Where does hematopoiesis mostly take place? In the red marrow of the bones
In adults, red marrow is limited to what areas? the spongy bone in the skull, ribs, sternum, clavicles, vertebrae, and pelvis
Name the two types of bone tissue Compact and spongy
What are the three types of bone cells? Osteoblasts, osteoclasts, and osteocytes
What are osteoblasts? Bone-forming cells
What are osteoclasts? Cells that absorb or break down bone
What are osteocytes? Mature bone cells
What is compact bone? bone with closely packed osteons
What is spongy bone? Bone that is lighter and less dense than compact bone.
What is ossification? the formation of bone
When does the skeleton begin to form? during the first few weeks after conception
Name the two types of ossification Intramembranous, and endochondral
What is intramembranous ossification? the replacement of sheet-like connective tissue membranes with bony tissue
What is endochondral ossification? the replacement of hyaline cartilage with bony tissue. Most bones of the body are formed this way
What is cartilage? a dense connective tissue that consists of fibers embedded in a strong, gel-like substance. It has the flexibility of firm plastic.
What are the three types of cartilage? hyaline, fibrous, and elastic
What are the four classifications of bones? Long, short, flat, and irregular
Name five functions of the human skeleton body support, protection of organs, movement, mineral storage, formation of blood cells
Created by: LCC