BELL WORK Write about a time you broke a bone or sprained your ankle.

BODY SYSTEMS SKELETAL SYSTEM

OBJECTIVES  explain the functions of the skeletal system.  identify four types of joints.  list some problems of the skeletal system.  practice healthful behaviors to keep your skeletal system healthy.

BONE FACTS You have 206 total bones in your body. When you were born you had over 300 bones. As you grew, some of these bones began to fuse together and now you have 206 bones. The human hand has 27 bones The longest bone in your body? Your thigh bone, the femur -- it's about 1/4 of your height. The smallest is the stirrup bone in the ear which can measure 1/10 of an inch.

BODY’S FRAMWORK The skeletal system helps you stand up and works with your muscles to help you walk, run, jump, bend, lift, and carry. skeletal system A body system made up of bones, joints, and connective tissue

BODY’S FRAMEWORK The skeletal system includes many bones that support the body and protect the organs.

BODY’S FRAMEWORK The backbone, or spinal column, consists of 24 separate bones called vertebrae.

FUNCTIONS The skeletal system provides a strong, stable framework capable of movement

FUNCTIONS The skeletal system supports and protects delicate internal organs.

FUNCTIONS Bones store important minerals such as calcium and phosphorus.

FUNCTIONS Bones produce the body’s blood cells. Little Red Riding Cell Her job is to carry oxygen to ALL OF THE CELLS IN THE BODY!

MARROW Red bone marrow makes millions of blood cells each day. marrow Soft tissue in the center of some bones

JOINTS joint The point at which two bones meet

JOINTS Some joints do not move. Others move only slightly, and others allow a wide range of movement.

JOINTS HING JOINTS These joints allow movement in one direction. Knees and elbows are hinge joints.

JOINTS GLINDING JOINGS Gliding joints help bones slide over one another without twisting. Examples include wrist and ankle joints, and connective bones below the neck in the collarbone.

JOINTS PIVOT JOINTS These joints allow movement with limited rotation. A pivot joint is found between the neck and the head.

JOINTS BALL AND SOCKET JOINTS These joints allow complete rotations, making it possible for bones to move in all directions. Your hips and shoulders are examples of ball-and-socket joints.

CONNECTIVE TISSUE cartilage A strong flexible, gel-like tissue that cushions your joints

CARTILAGE At joints where movement occurs, the bone surfaces are coated with smooth, slippery cartilage.

CONNECTIVE TISSUE tendons Tough bands of tissue that attach your muscles to bones

TENDON A large tendon that you can easily feel is your Achilles tendon.

CONNECTIVE TISSUE ligaments Cord-like tissues that connect the bones in each joint

LIGAMENTS Ligaments help hold bones in place.

PROBLEMS WITH THE SKELETAL SYSTEM FRACTURE A break in the bone caused by an injury

PROBLEMS WITH THE SKELETAL SYSTEM DISLOCATION When a bone is pushed out of its joint

PROBLEMS WITH THE SKELETAL SYSTEM SPRAIN Stretching or twisting of ligaments in a joint

PROBLEMS WITH THE SKELETAL SYSTEM OVERUSE INJURY An injury that happens over time, especially in sports

PROBLEMS WITH THE SKELETAL SYSTEM SCOLIOSIS A disorder in which the spine curves to one side of the body

PROBLEMS WITH THE SKELETAL SYSTEM OSTEOPOROSIS A condition characterized by brittle and porous bones

CARING FOR YOUR SKELETAL SYSTEM NUTRITION EXERCISE POSTURE PROPER PROTECTION