Comprehension Check Action Pontential
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Prince George's Community College, Largo *
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Course
2050
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Mechanical_engineering
Date
Apr 30, 2024
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4
Uploaded by BaronSummer17530
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
4/28/24, 11:08 PM Comprehension Check Action Potential: 2024SP-BI0O-2050-HY02 Human Anatomy & Physiology | just as likely to have an action potential in an absolute refractory period Question 10 0/1pts A stonger stimulus will do which of the following? Produce a stronger action potential Correct Answer Increase the frequency of action potentials generated Both a and B You Answered None of the above, as long as the stimulus is above threshold it will always have the same effect Question 11 1/1 pts When a neuron is depolarized but not to threshold the result is Correct! an EPSP an |IPSP an action potential none of the above Question 12 1/1 pts When neuron A stimulates a post-synaptic neuron, the result is an IPSP. However, when neuron A and B both stimulate the post-synaptic neuron at the same time, an action potential is initiated. This is an example of Temporal summation Correct! Spatial Summation A graded potential The all or none potential Question 13 0/1pts https://pgcconline.instructure.com/courses/20137/quizzes/2121737?module_item_id=2200637 4/5
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4/28/24, 11:08 PM Comprehension Check Action Potential: 2024SP-BI0O-2050-HY02 Human Anatomy & Physiology | After the hyperpolarization phase of an action potential, the axolemma returns to its resting membrane potential because of the action of the K+ channel You Answered Na+ channel Ca++ channel Correct Answer Na+/K+ pump Question 14 0/1pts If ligand gated sodium channels are stimulated to open, the result would be You Answered a hyperpolarizing graded potential Correct Answer a depolarizing graded potential an action potential an IPSP Ligand gated sodium channels are located in the cell body and dendrites. If they open there will definitely be a depolarizing gradient. Only if the threshold reaches threshold will an action potential occur. Question 15 1/1 pts Which of the following would affect the speed at which an action potential travels? diameter of axon mylenation of axon number of Na/K pumps Correct! both aand b https://pgcconline.instructure.com/courses/20137/quizzes/2121737?module_item_id=2200637 5/5