The Muscular System Chapter 7 The Muscular System Chapter 7.
Muscular system 1
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Transcript of Muscular system 1
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MUSCULAR SYSTEM
Skeletal Muscles and their classifications
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+KEY CONCEPTS
Skeletal muscles all have features that distinguish what they can do; in particular, movements that they make and force they can generate.
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+KEY FUNCTIONS
Support and posture – muscles are in a continuous state of ‘tone’ that affects their ability to help our body maintain an upright posture.
Poor posture can result in aches and pains
The trapezius, rhomboids and latissimus dorsi are crucialpostural muscles
Movement – voluntary control
Essential body functions – generally under involuntary control (which have little or no conscious control) Digestion Respiration Circulation
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+Common features of muscles
Nervous control – CNS stimulus controls muscle action
Contractility – when muscles contract they get shorter
Extensibility – muscles have the capacity to lengthen
Elasticity – muscles return to the original shape/size after stretching
Atrophy – muscles can decrease in size as a result of injury or lack of exercise
Hypertrophy – muscle can increase in size (grow) with increased exercise/training
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+MUSCLE FIBER TYPES
Cardiac Muscles of the heart
Smooth Digestive system and
blood vessels
Skeletal Attached to bones
and responsible for movement
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SKELETAL MUSCLES YOU NEED TO KNOW!
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CLASSIFICATION OF SKELETAL MUSCLE
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+OVERVIEW
Skeletal Muscles can be classified by their fibre arrangement around the tendon.
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+FUSIFORM MUSCLES
the muscle fibres run the length of the muscle belly.
Designed for mobility – low force over a long range
E.g. Sartorius, biceps
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+PENNIFORM MUSCLES
Fibres run at angles to the tendon. Designed for strength and power.
They make up 75 per cent of the skeletal muscles
Three Categories Unipennate Bipennate Multipennate
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+UNIPENNATE
Fibres are found on only one side of a central tendon
E.g. Tibialis Anterior
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+BIPENNATE MUSCLES The fibres run off either
side of a central tendon
E.g. rectus femoris (quads)
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+MULTIPENNATE MUSCLES Fibres branch out from
several tendons.
This arrangement enables the body the generate the greatest force.
E.g. Deltoid
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+Radiate Muscles
These muscles are a compromise between fusiform and pennate muscles because they are capable of producing strength and power without compromising mobility
Eg: pectoralis major, latissimus dorsi