| Types of Muscle Tissue | The Sarcomere | Muscle Contraction | More Muscle Contraction | Miscellaneous |
|---|---|---|---|---|
|
What are the types of muscle tissue?
Skeletal, Smooth, and Cardiac
|
What is the sarcomere?
The functional unit of a skeletal muscle fiber
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What is the Neuromuscular Junction (NMJ)?
site where the motor neuron’s axon terminal meets with the muscle fiber.
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What is the first step in muscle fiber excitation?
An ACTION POTENTIAL (AP) arrives at neuromuscular junction
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What is a tendon?
connect muscle to bone
|
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What is the location of smooth muscle?
Internal organs, blood vessels
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What is happening when the sliding filament theory is going on?
Actin slides past myosin as myosin pulls it
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What is the only way to activate skeletal muscle fiber to contract?
Excitation by a motor neuron
|
What is "The Triad"?
T-tubule + terminal cisterns of SR on each side
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What is c.t. “gift wrap” between skin and bones?
Fascia
|
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What is the only muscle that is autorhythmic?
Cardiac Muscle
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What does the thin filament consist of?
Actin, Troponin, Tropomyosin
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What is one somatic efferent neuron and all the muscle fibers it innervates?
A motor unit
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What is the result of the first step in muscle fiber excitation?
Motor neuron releases neurotransmitter acetylcholine (ACh) at the NMJ.
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What are the connective tissue layers in order from largest to smallest?
Epimysium, Perimysium, Endomysium
|
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What is an intercalated disc?
electrical (gap junction) & physical (desmosome) connection so heart contracts as syncytium (one unit)
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What happens in a sarcomere contraction?
Z-disc moves towards m line
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What mV is Resting Membrane Potential at?
RMP ranges from ~ -90mV to -70mV
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What is the function of the T-tubules?
carry Action Potential into cell’s interior
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What is the beginning of contraction?
When actin is pulled by myosin
|
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What are the two types of smooth muscle?
Visceral and multiunit
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What is the cause of the striation pattern in the sarcomere?
The organization of the myofilaments
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What are cell membrane potentials controlled by?
movements of ions through ion channels
|
What is one of the results following depolarization of the membrane?
Repolarization, cell membrane becomes more negative due to influx of K+ (potassium ions)
|
What are the three types of protiens that are in myofibrils and what do they do?
contractile - contraction
regulatory – turn contraction on/off Structural – provide alignment, elasticity, & extensibility |
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