Presentation is loading. Please wait.

Presentation is loading. Please wait.

The Skeletal System.

Similar presentations


Presentation on theme: "The Skeletal System."— Presentation transcript:

1 The Skeletal System

2 Basics Skeletal system – bones and connective tissue that holds them together Human skeleton has bones Cartilage – flexible connective tissue found between bones

3 More Basics Joint – place where two bones meet
Ligament – long flexible band of connective tissue that connects two bones at a joint

4 “Divisions” of the Skeletal System
Appendicular Allows body movement Bones in the limbs that extend from trunk: legs, arms, feet and hands Axial Bones found in head and trunk Includes vertebrae that protect the spinal cord

5 Major Bone Structure Spongy bone: less dense & surrounded by compact bone. Compact bone: hard & dense with calcium rings Periosteum: layer of connective tissue that covers/protects the bone.

6 Compact Bone Structure
Made of calcium-rich rings maintained by bone cells (osteocytes). At the center of the rings are channels called Haversian canals, containing a small blood vessel.

7 Functions of the Skeletal System
Provides support Allows for movement Protects internal organs Storage bank for minerals (calcium) Location for blood cell formation Red bone marrow is found in the spongy bone and produces blood cells Yellow marrow is mostly fat but can change back to red marrow if necessary (forms from red marrow) Different types of cells / cell parts produced in bone marrow

8 Bone Growth Human embryos start out with skeletons mostly made of cartilage. Osteoblasts – cells that secrete collagen and calcium phosphate to cause hardening – this is called ossification. Bones grow from their ends. They grow longer, thicker & wider.

9 Broken Bones Osteoblasts heal damaged/broken bones after growth has ended. Bones are strongest between 18 and 30. After that, calcium may be taken from the bones and used elsewhere in the body -so drink your milk!


Download ppt "The Skeletal System."

Similar presentations


Ads by Google