Unit B, Chapter 3, Lesson 1

The Skeletal System  Made up of 206 bones.  The bones of the face, skull, vertebral column and rib cage make up your body’s central framework for support. (Protects vital organs!)  Functions:  Supports you  Allows you to move  Protects vital organs  Produces blood cells

The Skeletal System Skull Clavicle Scapula Humerus Sternum Rib Cage Vertebrae Ulna Radius Femur Patella Fibula Tibia

The Femur is a bone in your arm. 1. Yes 2. No :

What is the long bone in your upper arm called? 1. Radius 2. Femur 3. Humerus

If someone were to tell you that they broke their collar bone, which bone would they be talking about? 1. Scapula 2. Skull 3. Phalanges 4. Clavicle 0 24

Your vertebrae protect your… 1. Brain 2. Spinal Cord 3. Liver 10 0 of 24

Which of the following connect bones to bones? 1. Ligaments 2. Tendons 3. Cartilage 10 Seconds Remaining

Anatomy of a Bone The Inside of a Long BoneParts of a Long Bone  Spongy Bone  Bone Marrow  Compact Bone  Periosteum  movie/bodybasics/bone.ht ml movie/bodybasics/bone.ht ml

Support and Movement  Which bones provide support and movement?  Bones of the:  Arms  Legs  Pelvis  They work with muscles to help us move!  asics/bones_muscles_joints.html asics/bones_muscles_joints.html

Important “Bone” Terms  Cartilage: a strong flexible tissue on the ends of some bones  It provides a cushion where bones come together.  Ligaments: strong cords of tissue that connect the bones in your joints.

How do our bones move?  Joint: a point at which two bones meet.  Without joints, you could not move.  Three main kinds of joints:  Hinge Joint  Ball and Socket Joint  Fixed Joint

Joints Types of JointsMovementsLocations Hinge Joint Allows back and forth movement. Elbow, Knees Fixed JointNo movement is allowed.Plates of the skull Ball-and-Socket Joint Allows a wide range of movements. Shoulder, Hip

Problems and Caring for the Skeletal System

Skeletal System Problems Scoliosis Photograph of someone with scoliosis.  Causes: deformity of the spine win which the spine develops an S-shaped curve when viewed from behind.  Can this affect you? Affects 2% of women and.5% of men in the general population

Skeletal System Problems OsteoporosisOsteoporosis Fact!  A disease in which bones become thin and brittle.  Who does this affect?  55% of people who are over the age of 55.  Of the 10 million Americans who have this disease, 8 million are women and 2 million are men.  (from osis/diseasefacts.htm)  About 85-90% of adult bone mass is acquired by age 18 in girls and 20 in boys. Building strong bones during childhood and adolescence can help to prevent osteoporosis later in life.  (from orosis/diseasefacts.htm)

Skeletal System Problems Sprain What happens when you sprain your ankle?  Stretching or partial tearing of ligaments.  Can be painful and cause swelling around the injured joint.  /flash/body/yuckystuff/ankl esprain/js.index.html /flash/body/yuckystuff/ankl esprain/js.index.html

Caring for your Skeletal System  Exercise regularly using weights, walking, running, jumping rope, dancing, hiking, soccer, or basketball (just to name a few activities!).  Wear proper fitting shoes.  Select foods and beverages rich in calcium, phosphorus, and vitamin D.  Sit, stand, and walk with correct posture.  Participate in screenings for scoliosis.