During the relative refractory period, a larger than normal stimulus is required togenerate an action potential. Which of the following statement/s explains thissituation?O the inside of the cell is hyperpolarized and farther away from thresholdO potassium voltage gated channels closed too soon and prevented potassium ionsentering the cellpotassium voltage gated channels did not all close at the same time and more than therequired number of potassium ions exited the cella and c« PreviousNext

Following an absolute refractory period, the inactivated sodium channels get the transition to a…

Answered: Buring the relative refractory period,…

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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What stage of the action potential is illustrated by the set up shown? interstitial fuid axon cytoplasm interstitial fiuid Resting potential Hyperpolarization O Depolarization Repolarization K'charnel
If K+ channels are blocked by TEA (tetraethyl ammonium), what happens to the equilibrium potential for K+? Becomes more positive Becomes more negative Does not change
If action potential propagation from one neuron to another neuron requires ACh release, what event at the synaptic cleft explains the need for action potentials to arrive at a high rate before the post-synaptic membrane achieves threshold? the lack of sodium voltage gated channels on the post-synaptic membrane O the rapid breakdown of ACh by ACHE at the synaptic cleft the slow release of ACh by the synaptic vessicles the slow movement of sodium through chemical gates Previous Next MacBook Air
Saltatory conduction occurs on? Dendrites Cell bodies Unmyelinated axons Myelinated axons None of the above All of the above
An action potential Membrane potential (mV) -40 40 -65 II -80 0 -Overshoot Rising Falling phase phase III Voltage threshold Resting potential Undershoot 1 2 3 4 Time (ms) In the figure above, which arrow best represents the point where the voltage-gated sodium channels are inactivated and locked? OI ○ III O IV ○ II
Continuos propagation of action potentials occurs in myelinated axons and is faster than conduction in unmyelinated axons. True False
Which of the following takes place during an action potential? Na+ ions exit the cell causing depolarization Repolarization occurs when K+ ions enter the cell The membrane becomes more negative during depolarization K+ ions start the action potentials Na+ enters the cell making the membrane potential positive.
Expression of which of the following lowers the threshold for firing action potentials? O A. Voltage-dependent K* channels OB. Na+, K+-ATPase OC. GABAA receptors OD. CI channels O E. Voltage-dependent Na* channels
In the dark, bipolar cells are O inactive due to open Cl- channels active due to open Na+ channels inactive due to closed Ca++ channels active due to open Ca++ channels
As the action potential (AP) propagates away from the axon hillock, why does it continue in one direction (downstream)? the region behind the AR is in absolute refractory period the region in front of the AP is in absolute refractory period they travel the path of least resistance the region behind the AP runs out of NA+ ions Both A and B
What causes Hyperpolarization following the spike of the action potential? Voltage-gated K+ channels close slowly allowing K+ ions to leave the cell The opening of leaky Na+ channels The Na+/K+ pump briefly reverses the direction of ion flow Both Na+ channels and K+ channels become inactivated Na+ and Cl- enter the cell until the Na+/Cl- pump closes
An action potential travels down a neuron: O From dendrite to axon terminals Moves even faster because of the Nodes of Ranvier Involve Sodium Potassium Pumps All of the above

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