Transcript The Muscular System - MrTestaScienceClass

The Muscular System
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Types of Muscles
Skeletal Muscle
 Smooth Muscle
 Cardiac Muscle
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**Muscles are connected to bones by tendons
Human Body for Students: Muscular System
The Muscular System
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Skeletal Muscle
Attached to and moves bones
 Contracts/relaxes to move bone
 Muscle is striated (banded)
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Consists of bundles of muscle fibers
Voluntary Muscles
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Move only when you want them to
The Muscular System
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Smooth Muscle
Does not have bands
 Involuntary
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Contract without actively causing them
to
Tires slowly
 Control breathing, blood pressure,
and digestive system
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The Muscular System
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Cardiac Muscle
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Found only in heart
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Fibers make complex mesh
Involuntary
 Does not tire
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The Muscular System
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Actions of Skeletal Muscles
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Work in pairs
Flexor-muscle that bends part of the body
 Extensor-muscle that straightens the body
part
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Nerve tissue “tells” muscles to contract or
relax
 “Strong” contractions occur when many
muscle fibers are signaled to do so
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Injuries to Muscular System
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Possible Injuries
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Strains
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Tendonitis
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Muscles or tendons are pulled beyond normal
range of motion
Tendons are over used & become inflamed
Anabolic Steroids
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Cause high bp; damage heart, liver, and
kidneys; can stop bone growth
Injuries to Muscular System
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Healing Injuries
Limit mobility for an extended period of
time
 Apply ice (reduce swelling) then heat
(relax and loosen muscles)
 Apply electric current to stimulate healing
process
 Shorten or replace ligaments/tendons
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Injuries to Muscular System
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Exercise to Reduce Risk
Strengthen skeletal muscles by
Resistance Exercise (bench press, pull
ups)
 Aerobic Exercise
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Strengthen heart and increase
endurance
 Jogging, cycling, swimming
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How Muscles & Bones Work Together
How Your Body Works: Bone and Muscle
How We Control Bones and Muscles