Chapter 16
Your Body Systems
Lesson 1
Your Skeletal System
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 skeletal
system
A body system made up of bones, joints, and
connective tissue
 marrow
Soft tissue in the center of some bones
 joint
The point at which two bones meet
 cartilage
Strong flexible, gel-like tissue that cushions your
joints
 tendons
Tough bands of tissue that attach your muscles to
bones
 ligaments Cord-like tissues that connect the bones in each joint
In this lesson, you will learn to
 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.
Analyzing a Graphic
Using Figure 16.1 on page 405, find examples of each kind of
joint discussed in the lesson.
Your Body’s Framework
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
The skeletal system includes
many bones that support the
body and protect the organs.
The backbone, or spinal
column, consists of 33
separate bones called
vertebrae.
Functions of Your Skeletal System
Skeletal System Functions
The skeletal system provides a strong, stable framework capable of movement.
The skeletal system supports and protects delicate internal organs.
Bones store important minerals such as calcium and phosphorus.
Bones produce the body’s blood cells.
Functions of Your Skeletal System
Red bone marrow makes millions of blood cells
each day.
marrow Soft tissue in the center of some bones
Joints
Some joints do not move. Others move only slightly,
and others allow a wide range of movement.
joint The point at which two bones meet
Joints
Hinge Joints
Gliding Joints
Types of
Mobile
Joints
Pivot Joints
Ball-and-Socket
Joints
Connective Tissue
At joints where movement occurs, the bone surfaces
are coated with smooth, slippery cartilage.
cartilage A strong flexible, gel-like tissue that cushions your joints
Connective Tissue
Tendons are another type of connective tissue.
tendons Tough bands of tissue that attach your muscles to bones
A large tendon that you can easily feel is your
Achilles tendon.
Connective Tissue
Ligaments help hold bones in place.
ligaments Cord-like tissues that connect the bones in each joint
Problems of the Skeletal System
Skeletal Problem
Description
Fracture
A break in the bone caused by an injury
Dislocation
When a bone is pushed out of its joint
Sprain
Stretching or twisting of ligaments in a joint
Overuse Injury
An injury that happens over time, especially in sports
Scoliosis
A disorder in which the spine curves to one side of the body
Osteoporosis
A condition characterized by brittle and porous bones
Caring for Your Skeletal System
Good Nutrition
Low-fat and fat-free dairy products
contain calcium and other nutrients
that are important to good health.
Caring for Your Skeletal System
Regular Physical Exercise
Regular exercise increases bone mass.
Caring for Your Skeletal System
Posture
Good posture keeps your
spine healthy.
Caring for Your Skeletal System
Protecting Yourself
Use protective gear when playing
sports, riding your bike, or in-line
skating.
Lesson 1 Review
What I Learned
Vocabulary What are joints? Name four types.
Lesson 1 Review
What I Learned
List Name three functions of the skeletal system.
Lesson 1 Review
What I Learned
Identify What are two problems of the skeletal system?
Lesson 1 Review
Thinking Critically
Apply You and another teen on the gymnastics team
are practicing. You see your teammate doing an
exercise that the coach said not to do. What risk is your
teammate taking?
Lesson 1 Review
Thinking Critically
Synthesize Jan understands the importance of eating
foods rich in calcium. She is allergic to milk, however.
What suggestions can you make that might help Jan?
End of
Chapter 16
Your Body Systems
Lesson 1
Your Skeletal System
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