Exam 5 Flashcards
Which is a correct statement about forms of electrical potentials relevant to physiology?
A. A very large grade potential might not cause an action potential in an excitable cell
B. Only excitable cells are able to experience hyperpolarization
C. Action potentials sometimes have the same amplitude
D. An outflux of sodium from a cell will sometimes cause a graded potential
A. A very large grade potential might not cause an action potential in an excitable cell.
An action potential will be more likely to occur when…
A. An inhibitory presynaptic potential occurs
B. The Vm of a red blood cell becomes less negative
C. A spatial summation has occurred
D. A large influx of anions has occurred for an afferent neuron
C. A spatial summation has occurred
Your classmate Carmen applied for an undergraduate research opportunity in a lab working on neuron summations. The interviewer asked. “What would happen if a hyperpolarizing stimulus and a depolarizing stimulus of identical magnitudes simultaneously impact a neuron?” Carmen correctly told the interviewer that this neuron will…
A. Be closer to its threshold potential
B. Remain at resting potential
C. Likely become depolarized
D. Be experiencing a temporal summation
B. Remain at resting potential
A typical cell’s resting potential is its ___ and regaining the value is called ___
A. Steady state, repolarization
B. Set point, repolarization
C. Steady state, depolarization
D. Set point, depolarization
B. Set point, repolarization
Libby was snacking and studying action potentials. When a crumb fell on the peak, Libby correctly stated that instantly after that point on the graph the cell would be ____ and potassium would be ____
A. Repolarizing, not yet crossing the membrane
B. Depolarizing, not yet crossing the membrane
C. Repolarizing, be exiting the cell
D. Depolarizing, be exiting the cell
C. Repolarizing, be exiting the cell
Which is a correct statement about membrane potential?
A. Every cell in the body has the same resting membrane potential of about -70mV
B. It is impacted only by charged compounds
C. Only some cells have one and it can change
D. It is the measurement of the charge gradient within the plasma membrane
B. It is impacted only by charged compounds
Which is a correct statement about synapse strength?
A. Calcium must be available in the largest fluid compartment to enter the presynaptic cell
B. The calcium entry is due to voltage-gated channels
C. Receptor availability is not important for the presynaptic cell
D. The neurotransmitters are released due to a rise in intracellular sodium
B. The calcium entry is due to voltage-gated channels
In her neurophysiology lab, Gracie is tasked with evaluating two neurons. Neuron 1 lacks dendrites and has other cells connected to its axon. Neuron 2 has dendrites but not cells connected to its axon. Therefore, Gracie correctly stated that…
A. Neuron 2 will be quicker to convey electrical messages
B. Graded potentials will not exist on Neuron 2’s axon
C. Neuron 1 is a part of the afferent pathway
D. The axons will be found within different fluid compartments
C. Neuron 1 is a part of the afferent pathway
Which is a correct statement about graded potentials?
A. They can be variable in size
B. They can occur in most cells
C. They are widespread events
D. An action potential is not a type of them
A. They can be variable in size
During a recent workout, Brutus injured some neurons that belong to neither the most numerous nor least numerous type. Consequently, Brutus correctly expects that he might have difficulty…
A. Feeling his toes
B. Screaming at something scary
C. Both statements are correct
D. Neither statement is correct
B. Screaming at something scary
Dr Gray’s Patient Y has atypically slow neuro responses. Dr G correctly states that it might be caused…
A. Too much myelination
B. Atypically wide chemical synapses
C. Both statements are correct
D. Neither statement is correct
B. Atypically wide chemical synapses
Which is a correct analogy for saltatory conduction?
A. A frog swimming under the water from lily pad to lily pad
B. A Burrowing Owl moving through its tunnel from one tunnel entrance to another
C. Both analogies are correct
D. Neither analogy is correct
C. Both analogies are correct
Dr. Scarlet’s Patient X is experiencing weaker than typical depolarizations during their action potentials. Dr. S correctly notes that this situation might be resolved by a medication that increases the number of…
A. Voltage-gated sodium transporters
B. Sodium-Glucose Transporters
C. Both statements are correct
D. Neither statement is correct
D. Neither statement is correct
Sparty was shrunk to the size of an ion. This warrior then found himself observing slower than typical neurotransmitter release by a neuron. Sparty correctly noted that…
A. The axon terminal might by hyperpolarized
B. An antagonist is not causing the slowness
C. Both statements are correct
D. Neither statement is correct
C. Both statements are correct.
Which is a correct statement about summations?
A. A neuron can experience both types simultaneously,
B. Only spatial summations are an example of convergence
C. Both statements are correct
D. Neither statement is correct
C. Both statements are correct.
