Exam 4 Bio psych
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How do muscles work?
Actively shortening, pulling but not pushing
Agonist muscle
muscles working together to perform a movement
muscles working together to perform a movement
Agonist muscle
antagonist muscle
muscles that act to resist a specific movement
muscles that act to resist a specific movement
Antagonist muscle
Flexor
muscle that acts to bend a joint
muscle that acts to bend a joint
Flexor
Extensor
Muscle that acts to extend a joint
Muscle that acts to extend a joint
Extensor
Neuromuscular Junction
A synapse between a motor neuron and muscle fiber
A synapse between a motor neuron and muscle fiber
Neuromuscular Junction
Twitch
A single action potential at a neuromuscular junction causing a muscle contraction
A single action potential at a neuromuscular junction causing a muscle contraction
twitch
Acetylcholine
Neurotransmitter at the neuromuscular junction
Neurotransmitter at the neuromuscular junction
Acetylcholine
Alpha motorneuron
Final stage in motor pathway. Has cell bodies in the spinal cord and axons that project to muscle fibers.
Final stage in motor pathway. Has cell bodies in the spinal cord and axons that project to muscle fibers.
Alpha motorneuron
Motor unit
Neuron with all of its associated muscle fibers
Neuron with all of its associated muscle fibers
Motor unit
Why do some contractions involve more motor units?
More intensity of the contractions means more motor units
Motor units close together form what?
Motor Pool
Motor unit is the smallest functional element to control the strength of what?
Contraction
Muscles cannot actively lengthen. T or F?
True
What are the 2 main cortical areas of the brain involved in motor control?
Primary and Secondary motor cortex