Transcript Your Mental and Emotional Health

Lesson 3
The Muscular System
How can you keep your muscles flexible and strong?
Proper warm-up and stretching
before and cool-down after any
physical activity keeps your
muscles flexible and strong.
Lesson 3
Lesson Objectives
In this lesson, you’ll learn to:
Explain the functions of the muscular system.
Describe the different types of muscles in the body.
Examine the effects of health behaviors on the muscular
system.
Identify problems of the muscular system.
Lesson 3
Functions of the Muscular System
Voluntary and Involuntary Muscles
When you sleep, muscles help you breathe, make your heart
beat, and move food through your digestive system.
These involuntary processes happen without your consciously
controlling them.
When you play the piano or a video game, you are using
muscles that are under conscious, or voluntary, control.
Without the use of both voluntary and involuntary muscles,
you would be unable to perform any of these activities.
Lesson 3
Structure of the Muscular System
Nerve Impulses and Muscle Fibers
A muscle is made up of hundreds of long cells called fibers.
Muscles work by means of two complementary, or opposing,
actions—contraction and extension.
Muscle contraction is triggered by nerve impulses.
Some nerves provide impulses for many muscle fibers.
In other areas, a single nerve may provide impulses to only
two or three muscle fibers.
Lesson 3
Structure of the Muscular System
Types of Muscles
Smooth
Muscles
Skeletal
Muscles
Cardiac
Muscles
Smooth muscles can be found in the
lining of the blood vessels, the
digestive tract, the passageways that
lead into the lungs, and the bladder.
Smooth muscles are under involuntary
control.
Lesson 3
Structure of the Muscular System
Muscle Contraction and Bone Movement
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Lesson 3
Structure of the Muscular System
Care of the Muscular System
Regular physical activity is the best way to keep your muscles
strong and healthy.
Regular physical activity helps keep muscles toned and healthy.
Practicing good posture strengthens back muscles.
Wearing safety equipment and appropriate clothing can protect
muscles during physical activity.
Lesson 3
Problems of the Muscular System
Injury-Related Muscle Problems
Bruise
Muscle
Strain/Sprain
Tendonitis
Hernia
Muscular
Dystrophy
Lesson 3
Problems of the Muscular System
Bruise
A bruise is an area of discolored skin that appears after an
injury causes the blood vessels beneath the skin to rupture
and leak.
Swelling can be reduced with an ice pack.
Lesson 3
Problems of the Muscular System
Muscle Strain or Sprain
A strained muscle results when a muscle is stretched or
partially torn as a result of overexertion.
Strains are usually treated by using the R.I.C.E. (rest, ice,
compression, elevation) procedure.
A sprain is an injury to the ligament in a joint, and it requires
medical treatment.
Lesson 3
Problems of the Muscular System
Tendonitis
Tendonitis can be caused by injury, overuse, or aging.
Treatment includes rest, anti-inflammatory medication, or
ultrasound.
Lesson 3
Problems of the Muscular System
Hernia
A hernia can result from straining to lift a heavy object.
Hernia repair usually requires surgery.
Lesson 3
Problems of the Muscular System
Muscular Dystrophy
Muscular dystrophy is an inherited disorder in which skeletal
muscle fibers are progressively destroyed.
There is no cure, but with early detection muscle weakness
can be delayed through exercise programs.
Lesson 3
Quick Review
Provide a short answer to the question given below.
Q. Give examples of how muscles work together with other
body systems.
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Lesson 3
Quick Review - Answer
A. Muscles work with respiratory, cardiovascular, and digestive
systems.
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Lesson 3
Quick Review
Provide a short answer to the question given below.
Q. Describe cardiac muscle.
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Lesson 3
Quick Review - Answer
A. Cardiac muscle is a type of striated muscle that forms the
wall of the heart.
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Lesson 3
Quick Review
Provide a short answer to the question given below.
Q. What is tendonitis? Why does it occur?
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Lesson 3
Quick Review - Answer
A. Tendonitis is the inflammation of a tendon caused by injury,
overuse, or aging.
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Lesson 3
Quick Review
Provide a suitable analysis.
Examine the effects of health behaviors on the muscular system.
Which muscles are most involved in your favorite physical
activities? What behaviors can help you protect the health of
these and other muscles?
Lesson 3
Structure of the Muscular System
Types of Muscles
Smooth
Muscles
Skeletal
Muscles
Cardiac
Muscles
Smooth muscles can be Smooth
found in the
lining of the blood vessels,
theact on
muscles
digestive tract, the passageways
the lining of that
lead into the lungs, and
the bladder.
passageways
and
internal organs.
Smooth muscles are under involuntary
control.
Lesson 3
Structure of the Muscular System
Types of Muscles
Smooth
Muscles
Skeletal
Muscles
Cardiac
Muscles
Skeletal
Most of your muscle tissue
is made up of
muscles
skeletal muscle, and
almostare
all skeletal
attached to bone
muscles are under voluntary control.
and cause body
Skeletal muscles often work together,
movements.
undergoing opposing actions to produce
movement.
Flexor and extensor are opposing
skeletal muscles.
Lesson 3
Structure of the Muscular System
Types of Muscles
Smooth
Muscles
Skeletal
Muscles
Cardiac
Muscles
Most of your muscle tissue is made up of
skeletal muscle, and almost all skeletal
The flexor
muscles are under voluntary control.
is the muscle
Skeletal
muscles
that closes
a often work together,
undergoing
opposing actions to produce
joint.
movement.
Flexor and extensor are opposing
skeletal muscles.
Lesson 3
Structure of the Muscular System
Types of Muscles
Smooth
Muscles
Skeletal
Muscles
Cardiac
Muscles
Most of your muscle tissue is made up of
skeletal muscle, and almost all skeletal
The
muscles are under voluntary control.
extensor is the
Skeletal muscles often work together,
muscle that
undergoing opposing
actions
to produce
opens
a joint.
movement.
Flexor and extensor are opposing
skeletal muscles.
Lesson 3
Structure of the Muscular System
Types of Muscles
Smooth
Muscles
Skeletal
Muscles
Cardiac
Muscles
The involuntary cardiac muscles are
responsible for the contraction of your
heart.
Cardiac
The heartmuscle
contracts
about
is a rhythmically
type of
100,000 striated
times each
day to pump blood
muscle
throughout
your
body.
that
forms
the wall
of the heart.
Lesson 3
Structure of the Muscular System
Care of the Muscular System
Regular physical activity is the best way to keep your muscles
strong and healthy.
Regular physical activity helps keep muscles toned and healthy.
Muscle tone
Practicing good posture strengthens
back muscles.
is the natural
Wearing safety equipment
and in
appropriate
clothing can protect
tension
the
muscles during physicalfibers
activity.
of a
muscle.
Lesson 3
Problems of the Muscular System
Tendonitis
Tendonitis can be caused by injury, overuse, or aging.
Therest, anti-inflammatory medication, or
Treatment includes
ultrasound. inflammation of
a tendon is
called
tendonitis.
Lesson 3
Problems of the Muscular System
Hernia
A hernia can result from straining to lift a heavy object.
Hernia repair usually requires surgery.
A hernia
occurs when an
organ or tissue
protrudes through
an area of weak
muscle.
Lesson 3
Structure of the Muscular System
Types of Muscles
Smooth
Muscles
Skeletal
Muscles
Cardiac
Muscles
Most of your muscle tissue is made up of
skeletal muscle, and almost all skeletal
muscles are under voluntary control.
Skeletal muscles often work together,
undergoing opposing actions to produce
movement.
Flexor and extensor are opposing
skeletal muscles.
Lesson 3
Structure of the Muscular System
Types of Muscles
Smooth
Muscles
Skeletal
Muscles
Cardiac
Muscles
The involuntary cardiac muscles are
responsible for the contraction of your
heart.
The heart contracts rhythmically about
100,000 times each day to pump blood
throughout your body.