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