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Muscular System
Frontals
Trapezius
Deltoid
Trapezius
Deltoid
Pectoral
Triceps
Triceps
Biceps
Biceps
Latissimus Dorsi
Abdominals
Gluteus Maximus
Sartorius
Hamstring
Quadriceps
Gastrocnemius
Achilles Tendon
Gastrocnemius
Vocabulary
• Muscular System: the group of tough
tissues that make you body parts move.
• Contract: shortening of the muscle
• Extend: lengthening of the muscle
How do muscles work?
• You have over 600 muscles in your body
– They all work in pairs
– When one contracts the other extends
– Describe what happens when you bend and
straighten your arm…
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Your bicep pulls on your radius
Your triceps extend
Your triceps pull on your ulna
Your bicep extend
Diagram of a Muscle
Bone
Blood Vessel
Muscle Cell
Muscle Cell Bundle
Tendon
Muscle Body
Kinds of Muscle
• Smooth
– Can be found in organs
• Stomach
• Intestines
– Can NOT be controlled voluntarily. You don’t have to
think about moving your food through your digestive tract
after you swallow
Kinds of Muscle
• Cardiac
– Only found in one place in the body
– THE HEART
– Controlled by the brain
• Some people after years of training are able to raise and lower
their heart rate voluntarily
Kinds of Muscle
• Skeletal
– Attached to bone
– Allow you to move your body
– Skeletal muscles makeup about 40% of your body
weight
Problems with the Muscular
System
Problem
Description
Treatment
Pulled or Torn Muscle
Muscle tears from
bone
Rest / Ice for minor
tears
Surgery for major
tears
Strain
Soreness due to
overwork / over
stretched muscle or
tendon
Rest / Application of
ice and heat in 20
minute intervals
Cramp
Muscle contracts and Drink water / Massage
is unable to relax,
/ Application of heat
most commonly due to
lack of water
Problems with the Muscular
System
Problem
Description
Treatment
Tendonitis
Overstretched or torn
tendon
Rest and ice for minor
surgery for major
Muscular Dystrophy
And inherited disorder
in which the muscles
become weaker over
time and eventually
the person is no
longer able to walk or
stand
No cure