Homework Answers
1. Voltage gated Na+ channels
During depolarisation, Na+ channels are open and Na+ moves from outside to inside.
2. Unidirectionally
The propagation of action potential takes place in one directiona because the bsolute refractory period prevents the initiation of another action potential.
3. Voltage gated K+ channels
Repolarisation occurs due to the movement of potassium out of the cells
4. Na+/K+ pumps
The Na+/K+ pump transports sodium and potassium ions in and out of the cell to ensure that the electrochemical equilibrium remains unreached, and a resting membrane potential is maintained.
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choices for A: Na+/K+ pumps, voltage gated K+ channels,
voltage gated Ca+ channels, voltage gated Na+...
After a fraction of a second, K+ voltage gated channels at the site of the original...
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....
3. Many neurons contain "delayed K channels". Like voltage-gated Nat channels, these voltage-gated K+ channels open in response to a rise in membrane potential and then undergo inactivati...
3. Many neurons contain "delayed K channels". Like voltage-gated Nat channels, these voltage-gated K+ channels open in response to a rise in membrane potential and then undergo inactivation. However, opening of the voltage-gated K channels lags behind opening of the voltage-gated Na channels. a) Why does neuronal function require the voltage-gated K channels to open more slowly than the voltage-gated Na channels? b) Compared to a neuron that lacks voltage-gated K channels, what differences would you expect in the shape...
CNCORA 6 of 10 > Action potentials in neurons involve opening and closing of voltage-gated Nat...
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....
Q2. The Na+/K+ pump and voltage gated K+ channels both transport K+ across the membrane. A)...
Q2. The Na+/K+ pump and voltage gated K+ channels both transport K+ across the membrane. A) Compare and contrast these two mechanisms for K+ transport indicating important functional and structural differences. B) Describe the process for putting a voltage gated K+ channel in the membrane starting at the ribosome and ending at the plasma membrane.
6|EXAM 2 44. The giant axon found innervating the muscle of the squid mantle is able to rapidly transmit nervous st...
6|EXAM 2 44. The giant axon found innervating the muscle of the squid mantle is able to rapidly transmit nervous stimuli due to the fact that it A. has a higher than normal concentration of voltage gated Na+ and K+ channels in its axon B. has a larger diameter than most neurons, increasing the transmission rate of the signal C. has a higher concentration of Na'/ K pumps, allowing for increased rates of recovery from each stimulus event D.both b...
Lidocaine acts to inhibit the opening of voltage-gated Nat channels in neurons. Decide which line in...
Lidocaine acts to inhibit the opening of voltage-gated Nat channels in neurons. Decide which line in the figure below best represents how the administration of lidocaine would affect the change in membrane potential in response to an initial depolarizing stimulus. +40 - Une a Line b plasma membrane potential (mV) -40 Linec -60 1 2 time (msec) STIMULUS
Suppose that an artificial non-gated K+ channel could beinserted into the plasma membrane of an axon...
Suppose that an artificial non-gated K+ channel could
beinserted into the plasma membrane of an axon at resting
potential(membrane potential = -70 mV). Assume that the axon has
notrecently produced an action potential.
Answer questions 1-4 by selecting only from the
threeanswer choices to the left of each question. Drag the
correctanswer to the right of each question.
Suppose that an artificial non-gated K+ channel could beinserted into the plasma membrane of an axon at resting potential(membrane potential = -70...
Which of the following statement(s) regarding gated channels is/are FALSE? Gated channels facilitate the passage of...
Which of the following statement(s) regarding gated channels is/are FALSE? Gated channels facilitate the passage of ions such as Cl- and Na+ across the plasma membrane. Gated channels open or close in response to a signal. Gated channels facilitate the passage of small, nonpolar molecules such as O2 across the plasma membrane. Gated channels allow for the passive movement of substances across the plasma membrane in a process called facilitated diffusion. Gated channels facilitate the passage of small, nonpolar molecules...
Question 11 Not yet answered Marked out of 1.00 Flag question membrane potential (mV) ACTION POTENTIAL...
Question 11 Not yet answered Marked out of 1.00 Flag question membrane potential (mV) ACTION POTENTIAL threshold potential resting membrane potential depolarizing stimulus time (msec) STIMULUS What part of the action potential graph (indicated by Roman numerals) is mediated by delayed voltage-gated Na+ channels? Select one: O a. Il O b. I OC.IV O d. I and V Oe. Il and IV Question 12 Not yet answered Marked out of 1.00 Flag question +40 membrane potential (mv) ACTION POTENTIAL threshold...
29 From the following graph, which channels/pumps are open/active at position 4? Mark all that apply...
29 From the following graph, which channels/pumps are open/active at position 4? Mark all that apply A. Na+/K+ Pump B. Voltage gated Na+ Channel C. Voltage gated K+ Channel D. Passive K+ channel E. None of the pump/channels are open/active Membrane potential (m)
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....
3. Many neurons contain "delayed K channels". Like voltage-gated Nat channels, these voltage-gated K+ channels open in response to a rise in membrane potential and then undergo inactivation. However, opening of the voltage-gated K channels lags behind opening of the voltage-gated Na channels. a) Why does neuronal function require the voltage-gated K channels to open more slowly than the voltage-gated Na channels? b) Compared to a neuron that lacks voltage-gated K channels, what differences would you expect in the shape...
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....
Q2. The Na+/K+ pump and voltage gated K+ channels both transport K+ across the membrane. A) Compare and contrast these two mechanisms for K+ transport indicating important functional and structural differences. B) Describe the process for putting a voltage gated K+ channel in the membrane starting at the ribosome and ending at the plasma membrane.
6|EXAM 2 44. The giant axon found innervating the muscle of the squid mantle is able to rapidly transmit nervous stimuli due to the fact that it A. has a higher than normal concentration of voltage gated Na+ and K+ channels in its axon B. has a larger diameter than most neurons, increasing the transmission rate of the signal C. has a higher concentration of Na'/ K pumps, allowing for increased rates of recovery from each stimulus event D.both b...
Lidocaine acts to inhibit the opening of voltage-gated Nat channels in neurons. Decide which line in the figure below best represents how the administration of lidocaine would affect the change in membrane potential in response to an initial depolarizing stimulus. +40 - Une a Line b plasma membrane potential (mV) -40 Linec -60 1 2 time (msec) STIMULUS
Suppose that an artificial non-gated K+ channel could
beinserted into the plasma membrane of an axon at resting
potential(membrane potential = -70 mV). Assume that the axon has
notrecently produced an action potential.
Answer questions 1-4 by selecting only from the
threeanswer choices to the left of each question. Drag the
correctanswer to the right of each question.
Suppose that an artificial non-gated K+ channel could beinserted into the plasma membrane of an axon at resting potential(membrane potential = -70...
Which of the following statement(s) regarding gated channels is/are FALSE? Gated channels facilitate the passage of ions such as Cl- and Na+ across the plasma membrane. Gated channels open or close in response to a signal. Gated channels facilitate the passage of small, nonpolar molecules such as O2 across the plasma membrane. Gated channels allow for the passive movement of substances across the plasma membrane in a process called facilitated diffusion. Gated channels facilitate the passage of small, nonpolar molecules...
Question 11 Not yet answered Marked out of 1.00 Flag question membrane potential (mV) ACTION POTENTIAL threshold potential resting membrane potential depolarizing stimulus time (msec) STIMULUS What part of the action potential graph (indicated by Roman numerals) is mediated by delayed voltage-gated Na+ channels? Select one: O a. Il O b. I OC.IV O d. I and V Oe. Il and IV Question 12 Not yet answered Marked out of 1.00 Flag question +40 membrane potential (mv) ACTION POTENTIAL threshold...
29 From the following graph, which channels/pumps are open/active at position 4? Mark all that apply A. Na+/K+ Pump B. Voltage gated Na+ Channel C. Voltage gated K+ Channel D. Passive K+ channel E. None of the pump/channels are open/active Membrane potential (m)
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