An ion channel inhibitor is discovered which selectively targets potassium ion voltage-gated channels. Which of the following effects would this inhibitor most likely have on neurons? and here are the answer choices,
A. |
Decrease in the sensitivity of action potential generation |
B. |
Increase of the resting potential of the cell to 0 mV |
C. |
Inhibition of repolarization after an action potential |
D. |
Inhibition of action potential depolarization |
voltage-gated K+ channels in the neuron allow the movement of K+ from neurons to outside, which helps in repolarization after an action potential, so inhibiting K+ channel Inhibits repolarization after an action potential
c) inhibition of repolarization after an action potential
An ion channel inhibitor is discovered which selectively targets potassium ion voltage-gated channels. Which of the...
choices for A: Na+/K+ pumps, voltage gated K+ channels, voltage gated Ca+ channels, voltage gated Na+ channels choices for B: bidirectionally, unidirectionally choices for C: Na+/K+ pumps, voltage gated K+ channels, voltage gated Ca+ channels, voltage gated Na+ channels choices for D: Na+/K+ pumps, voltage gated K+ channels, voltage gated Ca+ channels, voltage gated Na+ channels Consider this graph illustrating the generation of an action potential across the plasma membrane of a stimulated neuron. +40 ACTION POTENTIAL plasma membrane potential...
CNCORA 6 of 10 > Action potentials in neurons involve opening and closing of voltage-gated Nat and K ion channels. Place the events of an action potential in order, starting and ending with a cell at its resting membrane potential. Resting state Return to resting state Answer Bank A graded potential brings the membrane to threshold potential. Fast Na+ and slow K* channels are activated. Nat rushes into the cell, causing membrane depolarization. K channels close slowly, resulting in hyperpolarization....
For each phase of an action potential, indicate the ion channel most responsible for the membrane potential change that occurs during the phase. Action Potential Phases Ion Channels Depolarization phase Repolarization phase Hyperpolarization phase Voltage-gated potassium channels Chemically-gated sodium channels Chemically-gated potassium channels Voltage-gated sodium channels
ana ion channels. The two ions in questions are Na+ (sodium ion) and K+ (potassium ion). The on channels/pumps are a) voltage-gated sodium channel, b) voltage-gated potassium channel, and c) sodium/potassium pump. a) Depolarization: b) Repolarization: c) Restoring ion concentrations:
Assume a mutation of the gene coding for the voltage-gated sodium channel resulted in channels that do not have the ball and chain part of the protein. Which of the following would you expect to see? a. A change in the ion selectivity of the channel of the mutated channels, allowing ions other than sodium to move through it. b. A change in the voltage sensitivity of the channel so that it does not open until more depolarized voltages. c....
Conotoxin is produced by marine cone snails. Among its effects is to block voltage-gated Ca2+ channels in neurons. A. What anatomical part of a neuron would be affected by conotoxin? B. How would the neuron’s action potential be affected by conotoxin? Explain, using at least TWO of the following terms: threshold, depolarization, repolarization, hyperpolarization, summation, IPSP, EPSP, exocytosis C. If conotoxin affected a somatic motor neuron, would this toxin cause muscle weakness or increased muscle tension? Explain why.
After a fraction of a second, K+ voltage gated channels at the site of the original stimulus open. K+ is more concentrated (outside/inside) the cell; therefore, K+ diffused (in/out). This causes the inside of the membrane to become more negative and return to its resting potential of -70 mV. The process is known as (de/re) polarization. In fact, outflow of K+ may be so great that (de/re/hyper) polarization occurs in which membrane potential becomes closer to (-50, -90 ) mV....
Question 4 2 pts During and action potential, sodium (Na+) rushes into the cell causing of the cell. Then sodium channels close and potassium (K+) rushes out of the cell, causing of the cell. However, the potassium overshoots and causes Question 5 2 pts During the refractory period, the pumps Na+ ions out of the cell and K+ions into the cell, re-establishing the resting membrane potential and concentration gradient. Serotonin Acetylcholine Glutamate Endorphins Barbiturates GABA Dopamine Cocaine Sodium Potassium Calcium...
D SCAN MATCHING 1. Depolarization 2. Action potential 3. Threshold 4. Repolarization 5. Relative refractory period 6. Absolute refractory period 7. Resting membrane potential 8. Continuous conduction 9. Saltatory conduction Choices A. a cell whose internal environment has an electrical charge equal to its external environment B. the process of a cell becoming positively charged C. the process of a cell becoming negatively charged D. an electrochemical change in the potential across a membrane that causes an electrical signal to...
Which statements describe the action potential in cardiomyocytes (heart muscle cells)? Depolarization stimulates voltage-gated, slow calcium channels to open. The absolute refractory period can last for about 200 ms. Rapid sodium influx causes the membrane to rapidly depolarize. Repolarization occurs immediately after the initial depolarization.