Muscle System
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PRESENTATION OUTLINE
Muscle System
By: Jazmin Lindseth and
Myology: the study of muscle structure,arrangement and actions of the muscles.
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The muscle system is developed from 3 different types of muscle
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SMOOTH MUSCLE
- Weakest muscle
- Involuntary
- Contracts slowly
- Can remain contracted for long periods of time
SMOOTH MUSCLE
- Not striated
- Includes he stomach,intestines,and blood vessels
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SKELETAL MUSCLE
- Only voluntary muscle group
- Long cells with multiple nuclei
- Striated
- 400 muscles
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CARDIAC MUSCLES
- Heart muscles
- Works 24/7
- Strongest set of muscles in the body
- Some striation
- Regulated body heat
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- Actin:def: protein that forms the contractile filaments of the muscles cells(thin muscle fibers)
- Myosin:def: fibrous protein (thick muscle connections)
MUSCLE CONTRACTIONS
CONTRACTIONS
- Brain sends signal
- Nerve impulses get sent to the muscle fibers
- Calcium is released
- Binds the myosin and actin
- Power stoke occurs
- ATP is used to release contraction
- Cross ridge waits for calcium
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FLEXORS AND EXTENSORS
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A flexor is a group of muscles that work together to bend a joint
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EXTENDORS
Extenders are a group of muscles that work together to extend and straighten joints
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MUSCLE FATIGUE
Muscle fatigue:def: A state of exhaustion or loss of strength and/or muscle endurance following strenuous activity
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Basically you just physically overwork yourself
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TEACHING MOMENT
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How are muscles, bones, and tendons related?
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Tendons attach muscle to bone
How are ligaments relate to tendons,muscles,bones?
Ligaments attach bone to bone,similar to how tendons attach muscle to bone
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ALL OR NOTHING RESPONSE
Def: the threshold response of each particular nerve cell and muscular fiber to a stimulus. A nerve cell with either fire completely or not at all; A muscle fiber will contract to its limit with a stimulus
10 MAJOR MUSCLES
MAJOR MUSCLES
- Biceps
- Triceps
- Trapezius
- Deltoids
- Pectorals
MAJOR MUSCLES
- Rectus abdominus
- Hamstrings
- Obliques
- Quadriceps
- Hamstrings
A FEW FUN FACTS
FUN FACTS
- 17 muscles to smile and 42 to frown
- The muscle system take up about 40% of a humans average body weight
- Smallest muscle is in the ear
- Muscles cannot push
