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BMC Exam 2 with complete solutions 2024_2025
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BMC Exam 2 with complete solutions 2024_2025
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BMC Exam 2 with complete solutions2024/2025
Nerve Impulse (Action Potential) - ANSWER-- the signal that passes from one
neuron to the next and finally the end organ (muscle fibers)
Dynamic Equilibrium - ANSWER--70 mV
changing the potential - ANSWER-Nerves transmit information by
__________________________ across the membrane
Depolarization - ANSWER-RMP moves closer to 0 mV
-55mV - ANSWER-Before a nerve can be depolarized and an AP started, there
must be sufficient stimulation.
In a nerve, typically this threshold is at ___________
afferent, efferent - ANSWER-__________neurons send sensory information to the
CNS
__________neurons send executing information to periphery (information to
cause your muscle to contract)
Central Nervous System (CNS) - ANSWER-oBrain, spinal cord
oWhere human movement is initiated, controlled, and monitored
Peripheral Nervous System (PNS) - ANSWER-oBranching nerves outside of spinal
cord
Neuron - ANSWER-oFunctional unit of the nervous system
, Motor neurons - ANSWER-oCarry signals to muscle
Afferent Neurons - ANSWER-oSensory: "ascending" info to spinal cord and brain
Efferent Neurons - ANSWER-oMotor: "descending" info from CNS/ Spinal Cord to
muscles
Internuerons - ANSWER-oAfferent to Efferent
oEfferent to Efferent
oHigher centers to spinal cords
Soma - ANSWER-oBody of cell
Ganglia - ANSWER-oBundles of cell bodies just outside the spinal cord
Dendrites - ANSWER-oProjections on the cell body that serve as receivers
Axon - ANSWER-oLarge nerve fiber that branches out from spinal cord
Alpha motor neuron - ANSWER-oLarge, rapidly transmitting neuron
Myelinated - ANSWER-oCovered with an insulated shell
Schwann cells - ANSWER-oInsulation enveloping specific section of axon
Node of Ranvier - ANSWER-oGap in between Schwann cells
Neuromuscular Junction - ANSWER-Motor end plates
Synapse
oSmall gap between terminal branch of neuron and muscle
motor unit - ANSWER--composed of a motor neuron and all of the muscle fibers it
innervates
-It is the smallest functional unit of muscular shortening
-# of fibers in a m.u. is dependent on the precision of movement required of that
muscle (average: 100-200 fibers per m.u.)
omore precision is obtained with more neurons
o100 to 2000 motor neurons per muscle
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