Comprehension Check Action Pontential

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Prince George's Community College, Largo *

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2050

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Mechanical_engineering

Date

Apr 30, 2024

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pdf

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4/28/24, 11:08 PM Comprehension Check Action Potential: 2024SP-B10-2050-HY02 Human Anatomy & Physiology | Na+ Correct! K+ Correct! Ca+ Mg++ Question 3 1/1 pts At what membrane potential do voltage gated Na+ ion channels open? -70mV Correct! -50mV OomV +30mV Question 4 1/1 pts During repolarization which of the following channels would you expect to be open? Select all that apply. Voltage gated Na+ channels Correct! Voltage gated K+ channels Correct! K+ leakage channels Voltage gated Ca++ channels Question 5 1/1 pts During this phase, another action potential cannot be initiated regardless of how stong the stimulus is Correct! Absolute refractory period Relative refractory period Resting period None of the above, an action potential can always be initiated. https://pgcconline.instructure.com/courses/20137/quizzes/2121737?module_item_id=2200637 2/5

4/28/24, 11:08 PM Comprehension Check Action Potential: 2024SP-B10-2050-HY02 Human Anatomy & Physiology | Question 6 1/1 pts Which of the following is responsible for the hyperpolarization phase of the action potential? opening of the Na+ channels inactivation of the Na+ channels Correct! prolonged opening of the K+ channels closing of K+ channels Question 7 1/1 pts During the relative refractory period you would expect the Na+ voltage gated channels to be in what state? Correct! Closed Open Inactive The Na+ channels can be in any of the above states Question 8 1/1 pts Which of the following explains why a graded potential does not travel (it is decremental) but the action potential travels (it propogates) down the axon. The graded potential is caused by the opening of voltage gated channels The graded potential is always hyperpolarizing Correct! The action potential is caused by the opening of voltage gated channels resulting in positive feedback. The action potential always depolarizes the membrane. Question 9 1/1 pts If the extracellular fluid surrounding the axolemma were to have an elevated level of Na+ ions, that axon would be more likely to have an action potential Correct! less likely to have an action potential https://pgcconline.instructure.com/courses/20137/quizzes/2121737?module_item_id=2200637 3/5

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