During depolarizationpotassium ions (K*) flow into the neuron.potassium ions (K*) flow out of the neuron.sodium ions (Na*) flow into the neuron.sodium ions (Na*) flow out of the neuron.23.а.b.C.d.During repolarizationpotassium ions (K*) flow into the neuron.potassium ions (K*) flow out of the neuron.sodium ions (Na*) flow into the neuron.sodium ions (Na*) flow out of the neuron.24.a.b.с.d.During the refractory periodsodium ions (Na*) are pumped out of the 'neuron.potassium ions (K*) are pumped into the neuron.proteins are pumped out of the neuron.Both “a" and “b" are correct.25.а.b.c.d.

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Answered: 23. During depolarization a. potassium…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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If the Cl- concentrations inside and outside of a neuron are 100 and 10 mM, respectively and the membrane potential is 30 mV, what would be the driving force on Cl- ions? Will chloride enter or exit the cell? Assume that the membrane is highly permeable to chloride. O a. 61 mV; enter O b. -41 mV; enter c. -31mV; exit O d. 91 mV; enter Ое. -82.8 mV; enter
42) If both Na+ and K+ channels are activated by depolarization, why do we see more Na+ flux during the rising phase of an action potential?
If a post synaptic neuron is stimulated to threshold by spatial summation this implies that Select one: a. the post synaptic cell has many voltage gated ion channels b. the post synaptic cell has a lower than normal threshold OC. the post synaptic cell is slow to repolarize d. the post synaptic cell is synapsing with multiple presynaptic neurons
9. All of the followings are incorrect about the Graded Potential, except ------------------------- A. It spreads Electrotonically B. It is amplified by distance C. It is inversely proportional to the duration and magnitude of stimulus D. It is regenerative E. it is generated at the axon hillock
Match the description with the statement that best describes the following statements hyperpolarization repolarization depolarization A. usually corresponds to opening of voltage-gated potassium channels B. any change in the membrane potential that moves the membrane potential to a value more positive than the resting potential (eg from -70mV to +35mV) C. any change in the membrane potential that moves the membrane potential to a value more negative than the resting potential (eg from -70mV to -85mV)
Event "D" in the diagram above is referred to as... O a. Polarization O b. Depolarization Oc. Refractory period d. Repolarization Use the following information to answer the next question Membrane potential (mv) Action potential of a neuron in response to a stimulus of -55 mV D A B Time
The axon hillock of a neuron reaches the threshold of excitation and the membrane potential becomes completely reversed. Then, suddenly, the membrane potential begins to return to resting membrane potential. What is the event that triggers this return to resting potential? A. Na+ channels close in a voltage-dependent manner B. Na+ channels close in a time-dependent manner C. Na+ channels close in a chemically-dependent manner D. Na+ channels open in a voltage-dependent manner
7. Draw a standard action potential compared to an action potential whose voltage gated potassium channels have been inactivated with tetraethylammonium (TEA). a. Draw the curves. Label all axes. b. Describe how and why they are different.
6. If the action potentials shown in the diagram below occur sequentially and in close temporal proximity, what will be the final result in cell D? In this notation, < indicates an excitatory an inhibitory synapse. Focus on overall effects – excitation and inhibition – don't worry about quantifying responses here. (Hint: you may want to identify what is happening at each cell and then how that will be affected by the activation of the previous cell) synapse and indicates Above Above threshold stimulation Above threshold stimulation threshold stimulation D

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