lesson 3 how can you keep your muscles flexible and strong? the muscular system proper warm-up and...
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LessonLesson 33How can you keep your muscles flexible and strong?
The Muscular System
Proper warm-up and stretching before and cool-down after any physical activity keeps your muscles flexible and strong.
LessonLesson 33
• Describe the functions of the muscular system
• Examine the different types of muscles in the body and the effects of health behaviors on the muscular system
• List problems of the muscular system
In this lesson, you will learn to:
Lesson Objectives
LessonLesson 33Functions 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 usingmuscles 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.
LessonLesson 33Nerve 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 onlytwo or three muscle fibers.
Structure of the Muscular System
LessonLesson 33Types of Muscles
Smooth Muscles
SkeletalMuscles
CardiacMuscles
Structure of the Muscular System
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.
LessonLesson 33Muscle Contraction and Bone Movement
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Structure of the Muscular System
LessonLesson 33
• 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.
Care of the Muscular System
Structure of the Muscular System
LessonLesson 33Injury-Related Muscle Problems
Bruise
Muscle Strain/Sprain
Tendonitis
Hernia
Muscular Dystrophy
Problems of the Muscular System
LessonLesson 33Bruise
• 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.
Problems of the Muscular System
LessonLesson 33Muscle 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.
Problems of the Muscular System
LessonLesson 33Tendonitis
• Tendonitis can be caused by injury, overuse, or aging.
• Treatment includes rest, anti-inflammatory medication, or ultrasound.
Problems of the Muscular System
LessonLesson 33Hernia
• A hernia can result from straining to lift a heavy object.
• Hernia repair usually requires surgery.
Problems of the Muscular System
LessonLesson 33Muscular 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.
Problems of the Muscular System
LessonLesson 33Quick Review
Q. Muscles work independently of
other body systems.
True
False
Choose the appropriate option.
LessonLesson 33
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Quick Review - Answer
A. False. Muscles work with respiratory, cardiovascular, and digestive systems.
LessonLesson 33Quick Review
Q. A type of striated muscle that
forms the wall of the heart is called:
Choose the appropriate option.
1. Skeletal muscle
2. Long muscle
3. Smooth muscle
4. Cardiac muscle
LessonLesson 33
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Quick Review - Answer
A. 4. Cardiac muscle
The cardiac muscle is responsible for the contraction of the heart and is the most important part of the cardiovascular system.
LessonLesson 33
Choose the appropriate option.
1. Tendonitis
2. Muscle strains and sprains
3. Bruises
4. Hernia
5. All of the above
Quick Review
Q. Problems of the muscular
system include:
LessonLesson 33
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A. 4. All of the above.
The problems of muscular system include all of the following: tendonitis, muscle strains and sprains, bruises, and hernia.
Quick Review - Answer
LessonLesson 33
End of Lesson 3
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LessonLesson 33Types of 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.
Smooth muscles are muscles that act on the lining of passageways and internal organs.
Smooth muscles are muscles that act on the lining of passageways and internal organs.
Structure of the Muscular System
Smooth Muscles
SkeletalMuscles
CardiacMuscles
LessonLesson 33Types of 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.
Skeletal muscles are attached to bone and cause body movements.
Skeletal muscles are attached to bone and cause body movements.
Structure of the Muscular System
Smooth Muscles
SkeletalMuscles
CardiacMuscles
LessonLesson 33Types of 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.
The flexor is the muscle that closes a joint.
The flexor is the muscle that closes a joint.
Structure of the Muscular System
Smooth Muscles
SkeletalMuscles
CardiacMuscles
LessonLesson 33
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.
Types of Muscles
The extensor is the muscle that opens a joint.
The extensor is the muscle that opens a joint.
Structure of the Muscular System
Smooth Muscles
SkeletalMuscles
CardiacMuscles
LessonLesson 33Types of 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.
Cardiac muscle is a type of striated muscle that forms the wall of the heart.
Cardiac muscle is a type of striated muscle that forms the wall of the heart.
Structure of the Muscular System
Smooth Muscles
SkeletalMuscles
CardiacMuscles
LessonLesson 33
• 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.
Muscle tone is the natural tension in the fibers of a muscle.
Muscle tone is the natural tension in the fibers of a muscle.
Structure of the Muscular System
Care of the Muscular System
LessonLesson 33
• Tendonitis can be caused by injury, overuse, or aging.
• Treatment includes rest, anti-inflammatory medication, or ultrasound.
Tendonitis
Tendonitis is the inflammation of a tendon.
Tendonitis is the inflammation of a tendon.
Problems of the Muscular System
LessonLesson 33Hernia
• 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.
A hernia occurs when an organ or tissue protrudes through an area of weak muscle.
Problems of the Muscular System
LessonLesson 33
CardiacMuscles
Types of 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.
Structure of the Muscular System
Smooth Muscles
SkeletalMuscles
LessonLesson 33Types of 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.
Structure of the Muscular System
Smooth Muscles
SkeletalMuscles
CardiacMuscles
LessonLesson 33
A. Correct! Muscles work with respiratory, cardiovascular,
and digestive systems.
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Quick Review - Answer
LessonLesson 33
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Quick Review - Answer
LessonLesson 33
A. Correct! The cardiac muscle is responsible for the
contraction of the heart and is the most important part of the cardiovascular system.
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LessonLesson 33
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LessonLesson 33
A. Correct! All of the above.
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LessonLesson 33
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