Comprehension Sypnase
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Apr 30, 2024
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4/28/24, 11:09 PM Quiz: Comprehension Check Synapse Comprehension Check Synapse Started: Apr 23 at 12:02am Quiz Instructions Use this link to access this week's comprehension check questions. These questions are for practice only to help you identify any areas of confusion and do not count toward your final grade in this class. Once you submit the practice questions you will see which answers you missed. Answers for all questions will be available on Saturday. Please email me with any questions you have. Question 1 1 pts Where does the action potential begin? O Dendrites O Soma O Synapse @ Axon Hillock Question 2 1 pts If the resting membrane potential of a neuron is -70mV and the threshold is -55mV, a graded membrane potential (postsynaptic potential) of -60mV will
.....
O produce an action potential @® make it easier to produce an action potential O make it harder to produce an action potential O hyperpolarize the membrane Question 3 1 pts What is the functional difference between voltage-gated, chemically gated, and mechanically gated ion channels? O voltage-gated channels cause depolarization of the membrane but mechanical and ligand gated ion channels cause hyperpolarization https://pgcconline.instructure.com/courses/20137/quizzes/212144/take 1/6
4/28/24, 11:09 PM Quiz: Comprehension Check Synapse O mechanical gated ion channels are located in the soma (cell body) but voltage-gated channels are located in the dendrites. O different stimuli open the different types of channels O only voltage gated channels will cause a change in membrane potential when they open Question 4 1 pts Which of the following occurs at threshold? (more than one may apply) O Sodium channel's inactivation gate opens O Sodium channel's activation gate opens O sodium diffuses out of the cell O sodium diffuses into the cell Question 5 1 pts Depolarization of a neuron's membrane will shift the membrane potential toward O 0OmVv O -710 mV O -90 mV O all of these Question 6 1 pts What effect does decreasing the extracellular potassium concentration have on the membrane potential of a neuron? O Depolarizes the membrane O Hyperpolarizes the membrane O Has not effect on the membrane potential https://pgcconline.instructure.com/courses/20137/quizzes/212144/take 2/6
4/28/24, 11:09 PM Quiz: Comprehension Check Synapse O Brings the membrane potential to 0 mV Question 7 1 pts During the relative refractory period, another action potential can be initiated
.......
O but the stimulus has to be greater because the membrane is hyperpolarized O but the stimulus has to be greater because the potassium voltage gated channels are still open and potassium is leaking out. O because the voltage gated sodium ion channel is reset back to resting state where it can be stimulated to open by a change in voltage to threshold O all of the above are true Question 8 1 pts Graded potentials must reach threshold in order for any change to occur. O True O False Question 9 1 pts Action potentials travel because O depolarization at the hillock causes depolarization of the neighboring voltage gated sodium ion channels all the way down to the end bulbs O sodium rushes in at the axon hillock and travels all the way down to the synaptic end bulb O potassium channels are slow to open O the sodium potassium pump re-establishes the chemical gradient for sodium and potassium Question 10 1 pts What effect would blocking the calcium voltage gated ion channels have on communication across the synapse? O blocking calcium channels would hyperpolarize the membrane and inhibit the action potential https://pgcconline.instructure.com/courses/20137/quizzes/212144/take 3/6
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