Presentation on theme: "The Skeletal System Tuesday, February 2, 2010 Pages"— Presentation transcript:
1The Skeletal System Tuesday, February 2, 2010 Pages 480 -- 487 Chapter 15, Section 2The Skeletal SystemTuesday, February 2, 2010Pages
2Objectives Identify the functions of the skeleton. Describe the structure of bones and how they grow and form.Explain the role of movable joints in the body.List ways that individuals can keep their bones strong and healthy.
4Function of the Skeletal System Five major functions:Provides shape and supportEnables movementProtects internal organsProduces blood cellsStores certain materials until they’re needed by the body.
5Skeletal SystemThe human skeleton provides a framework that supports and protects many other body parts.The vertebral column is the center of the skeleton.
6Skeletal System - cont’d The skeleton allows movement.The bones protect many of the organs in your body.Some bones produce substances needed by the body.Some bones store minerals such as calcium and phosphorus.
7Bones Bones are alive. Bones are strong and lightweight. Only about 20 percent of an average adult’s body weight is bone.Bones contain cells and tissues.
8Structure of BonesA thin, tough membrane covers all of the bone except for the ends.Blood vessels and nerves enter and leave the bone through the membrane.Compact bone is beneath the membrane.
9Structure of Bones - cont’d Inside the compact bone is a layer of spongy bone.Spaces in the bone contain marrow, a soft connective tissue.2 types of marrow:Yellow: stores fat which serves as an energy reserve.Red: produces the body’s blood cells.
10Cartilage A connective tissue that is more flexible than bone. Hard bone tissue replaces cartilage over time.Cartilage covers the ends of many bones.
11Skeletal Joints Joints is where two bones come together. Allows movement in different ways.Two kinds of joints:Immovable jointsMovable joints
12Immovable Joints Joints that connect but allow little or no movement. The bones in the skull and the joints that attach the ribs to the sternum are examples.
13Movable Joints Most joints in the body are movable. Allows the body to make a wide range of movements.4 types of movable joints:Ball and socketHingePivotGliding
15Bone HealthHealthy bones need a combination of a balanced diet and regular exercise.Osteoporosis is the condition in which the body’s bones become weak and break easily.Osteoporosis more common in women than in men.