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Phys Week 7 Quiz

neurons, action potentials, synaptic transmission, neural transmitters

TRUE OR FALSE: IN A MYELINATED FIBER, THE ACTION POTENTIAL JUMPS FROM ONE NODE OF RANVIER TO THE NEXT TRUE
TRUE OR FALSE: IN A MYELINATED NEURON, THE IMPULSE CAN TRAVEL UNDER THE MYELIN BETWEEN NODES OF RANVIER TRUE
THE DIFFERENCE BETWEEN SODIUM AND POTASSIUM IN THE GENERATION OF ACTIO POTENTIAL IS THAT: SODIUM CAUSES DEPOLARIZATION OF THE CELL MEMBRANE, AND POTASSIUM CAUSES REPOLARIZATION OF THE CELL MEMBRANE
THE ACTION POTENTIAL SEEMS TO "LEAP" FROM NODE TO NODE ALONG A MYELINATED FIBER. THIS TYPE OF IMPULSE REGENERATION IS CALLED______________ CONDUCTION SALTATORY
AN ION CHANNEL THAT OPENS IN RESPONSE TO A SENSORY STIMULUS IS A(N)? STIMULUS-GATED CHANNEL
THERE ARE TWO TYPES OF SYNAPSES-THE ELECTRICAL SYNAPS AND THE ______________SYNAPSE. CHEMICAL
TRUE OR FALSE: NEURONS ARE THE ONLY LIVINGS CELLS THAT MAINTAIN A DIFFERENCE IN THE CONCENTRATION OF IONS ACROSS THEIR MEMBRANES FALSE
TRUE OR FALSE: THE THRESHOLD POTENTIAL IS SURPASSED, THE FULL PEAK OF THE ACTION POTENTIAL IS ALWAYS REACHED TRUE
TRUE OR FALSE:THE MAGNITUDE OF THE ACTION POTENTIAL PEAKS WHEN THE SODIUM CHANNELS CLOSE TRUE
THE MEMBRANE POTENTIAL MAINTAINED BY A NONCONDUCTING NEURONS PLASMA MEMBRANE IS CALLED THE___________MEMBRANE POTENTIAL. RESTING
TRUE OR FALSE: THE SODIUM-POTASSIUM PUMP ACTIVELY PUMPS THREE POTASSIUM IONS OUT OF THE NEURON AND TWO SODIUM IONS INTHE THE NEURON FALSE
WHEN THE NEUROTRANSMITTERS FROM SYNAPTIC KNOBS STIMULATE A POSTSYNAPTIC NEURON IN RAPID SUCCESSION, THEIR EFFECT CAN ADD UP OVER A BRIEF PERIOD TO PRODUCE AN ACTION POTENTIAL. THIS IS CALLED: TEMPORAL SUMMATION
WHICH MEMBRANE RECEPTOR ACTS TO DIRECTLY CHANGE ION PERMEABILITY WHEN STIMULATED? GATED-CHANNEL RECEPTOR
TRUE OR FALSE:THE DIFFERENCE IN ELECTRICAL CHARGE BETWEEN THE INSIDE AND OUTSIDE OF A MEMBRANE IS CALLED THE MEMBRANE POTENTIAL TRUE
A SYNAPSE CAN OCCUR ONLY BETWEEN AN AXON AND: A CELL BODY, ANOTHER AXON, AND A DENDRITE(ALL OF THE ABOVE)
A TERM COMMONLY USED AS A SYNONYM FOR ACTION POTENTIAL IS: NERVE IMPULSE
TRUE OR FALSE: THE SPEED OF A NERVE IMPULSE DEPENDS ON THE NEURON'S RESTING POTENTIAL FALSE
TRUE OR FALSE: IN DEPOLARIZATION THE MEMBRANE POTENTIAL MOVES TOWARD ZERO, WHEREAS IN HYPERPOLARIZATION THE MEMBRANE POTENTIAL MOVES AWAY FROM ZERO TRUE
IF THE MAGNITUDE OF THE LOCAL DEPOLARIZATION SURPASSES A LIMIT CAKED THE _______, VOLTAGE-GATED Na+ CHANNELS ARE STIMULATED TO OPEN THRESHOLD POTENTIAL
THE MECHANISMS THAT PRODUCE AND MAINTAIN THE RESTING MEMBRANE POTENTIAL DO SO BY PRODUCING A: SLIGHT EXCESS OF POSITIVE IONS ON THE OUTER SURFACE OF THE PLASMA MEMBRANE
TRUE OR FALSE: WHETHER AN IMPULSE IS CONTINUED THROUGH THE NEURON DEPENDS ON THE MAGNITUDE OF THE VOLTAGE IN THE AXON HILLOCK TRUE
THE BRIEF PERIOD DURING WHICH A LOCAL AREA OF AN AXON'S MEMBRANE RESISTS RE-STIMULATION IS CALLED THE _____________ PERIOD. REFRACTORY
THE ACTIVE TRANSPORT MECHANISM IN THE PLASMA MEMBRANE THAT TRANSPORTS SODIUM AND POTASSIUM IONS IN OPPOSITE DIRECTIONS AND AT DIFFERENT RATES IS THE? SODIUM-POTASSIUM PUMP
WHAT MECHANISM QUICKLY TERMINATES THE ACTION OF A NEUROTRANSMITTER ONCE IT BINDS TO ITS POSTSYNAPTIC RECEPTOR? ALL ARE CORRECT. NEUROTRANSMITTERS ARE METABOLIZED, TRANSPORTED TO NEARBY GLIAL CELLS AND TRANSPORTED BACK INTO SYNAPTIC KNOBS
TRUE OR FALSE: WHEN A NEURON IS RESTING, THE INNER SURFACE OF IT'S PLASMA MEMBRANE IS SLIGHTLY POSITIVE COMPARED WITH IT'S OUTER SURFACE FALSE
A MEMBRANE THAT EXHIBITS A MEMBRANE POTENTIAL IS SAID TO BE? POLARIZED
MOVEMENT OF THE MEMBRANE POTENTIAL AWAY FROM ZERO (BELOW THE USUAL RMP) IS CALLED? HYPERPOLARIZATION
A NEUROLOGIST IS USING A VOLTMETER TO MEASURE POTENTIAL. THE MEMBRANE POTENTIAL OF A NEURON WAS RECORDED AT +30mV. THIS IS WHAT TYPE OF MEMBRANE POTENTIAL? ACTION
THE TINY BULGE AT THE END OF A TERMINAL BRANCH OF A PRESYNAPTIC NEURON'S AXON IS CALLED A(N) SYNAPTIC KNOB
WHICH CHEMICALS ALLOW NEURONS TO COMMUNICATE WITH ONE ANOTHER? NEUROTRANSMITTERS
Created by: Kguerra03
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