the muscular system - linn–benton community collegecf.linnbenton.edu/mathsci/bio/jacobsr/upload/20...
TRANSCRIPT
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I N T R O D U C T I O N
The Muscular System
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Muscular System
Types of muscles
Cardiac
Skeletal
Smooth
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Table 9.3
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Introduction
Functions
1. Movement
2. Posture and body position
3. Heat production
4. Stabilizing joints
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Introduction
Characteristics of muscle tissue
1. Excitability
Ability to receive and respond to stimuli
2. Contractility
Ability to shorten when stimulated
3. Extensibility
Ability to be stretched
4. Elasticity
Ability to recoil to original shape
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Introduction
Types of muscle tissue
Skeletal muscle features
Striated
Voluntary
Powerful
Generates heat
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Introduction
Types of muscle tissue
Smooth (visceral) muscle features
Around hollow organs
Stomach, urinary bladder, blood vessels, and airways
Not striated
Involuntary
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Introduction
Types of muscle tissue
Cardiac muscle features
Only in the heart
Striated
Involuntary
Myogenic
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Macroanatomy of Skeletal Muscle
Muscle fibers (cells) are organized into muscles
Organized by connective tissue
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Thought Question
Why can a muscle be classified as an organ?
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Table 9.1
Anatomy of Skeletal Muscle
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Connective Tissue Organization
Fascia
Thin sheets of fibrous connective tissues
Supports muscles
Participates in muscle attachment
Passageway for nerves and blood vessels
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Connective Tissue Organization
Fascia
Epimysium
Perimysium
Endomysium
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Figure 9.1
Bone
Perimysium
Endomysium
(between individual
muscle fibers)
Muscle fiber
Fascicle
(wrapped by perimysium)
Epimysium
Tendon
Epimysium
Muscle fiber
in middle of
a fascicle Blood vessel
Perimysium
Endomysium
Fascicle (a)
(b)
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Connective Tissue Organization
Fascia Direct attachment Indirect attachment
Tendon Strap-like cord that attaches a muscle to a bone
Aponeurosis Broad, flattened, sheet-like tendon
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Connective Tissue Organization
Components are continuous with one another Series-elastic component
Extensible and elastic
Not excitable or contractile
Internal tension and external tension
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Accessory Structures
Blood vessels
Oxygen delivery and waste disposal
Neurons
Skeletal muscle cells are individually innervated
Cardiac and visceral muscles are linked by gap junctions
Allows impulse conduction between adjacent cells
Also respond to nerve impulses and hormonal signals