Download AP10 CH6 Muscle Physiology

PowerPoint® Lecture Slide Presentation
by Patty Bostwick-Taylor,
Florence-Darlington Technical College
The Muscular
System
6
PART A
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The Muscular System
Overview of Muscle Tissues
 Myo, mys, & sarco  muscle
 3 Types
1.
2.
3.
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Comparison of Skeletal, Cardiac,
and Smooth Muscles
Table 6.1 (1 of 2)
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Comparison of Skeletal, Cardiac,
and Smooth Muscles
Table 6.1 (2 of 2)
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
SKELETAL MUSCLES
Connective Tissue Surrounding
 Cells & muscles are surrounded and bundled by
connective tissue
 Attach to Bones:
 Tendons
 Aponeuroses
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Skeletal Muscle Functions
 M
 Posture
 Stabalizing Joints
 Generate heat
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Skeletal Muscle Activity
Skeletal Muscle Cell Characteristics
 Excitability:
 Contractility:
 Extensibility:
 Elasticity: recoil
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Microscopic Anatomy of Skeletal Muscle
 Fibers =
 Sarcolemma
 Myofibrils: long, thin organelles full of proteins
 Striations
 Proteins: Myosin & Actin
Segment of a Fiber
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Myofibrils …
 Sarcomere: functional unit of Myofibril
 Sarcomeres shorten:
 mechanism;:
 Calcium
 Myofibrils _____________
 Cell ______________
 Muscle _________________
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Sarcomeres
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings
Neurons of the Nervous System
 Neuron parts
 Cell Body
 Axon
 Axon Terminals
 Dendrites
Axon
Terminals
Cell body
Axon
Dendrites
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Neurons of the Nervous System …
Types of Neurons
• Sensory
• Motor
• Integration
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Figure 7.1
Skeletal Muscle Activity …
 Stimulation via Nervous System
 Contraction initiated by:
 Action Potential = Nerve
Impulse
Muscle Fiber
- mechanism
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Axon of
Motor Neuron
Terminal
Skeletal Muscle Activity …
Stimulation via Nervous System …
 Motor Unit = _______________________________
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Stimulation via Nervous System …
 Transfer of Action Potential to Fiber
 Neuromuscular Junction
 Neurotransmitter:
Neuromuscular
Junction
Neurotransmitters
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Contraction Steps: Beginning to End
1. Motor Neuron  Action Potential
2. Neurotransmitter
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2. Action Potential in Fiber
3. Calcium enters sarcomeres
Ca
Ca
Ca
Ca
Ca
Ca
Figure 6.6
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4 . Proteins in Sarcomere
5. Myofibril
6. Fibers
6. Muscle contracts
Copyright © 2009 Pearson Education, Inc., publishing as Benjamin Cummings