indentify the correct sequence of steps in the generation of an action potential? 1. activations of...
indentify the correct sequence of steps in the generation of an action potential?
1. activations of sodium channels and rapid depolarization 2. inactivaqtion of sodium channels and activation of potassium channels 3. depolarization of thershold 4. closing of potatssium channels
Homework Answers
An action potential is the electrical signal generated by the
neuron due to change in polarity of the cell membrane.
Generation of action potential involves opening and closing of
voltage gated ion channels.
Generation of action potential begins with change in resting
potential of the membrane due to a stimulus. The membrane reaches a
threshold potential after which the rapid depolarization of
membrane occurs. This causes opening of sodium channels. If the
current is strong enough all sodium channels are opened. This
causes reversal in membrane polarity. The sodium channels begins to
shut down. The potassium channels open and causes the membrane to
reach a resting potential.
So from the sbove explaination we can now arrange the sequence of
action potential generation as follows:
1. depolarization of threshold
2. . activations of sodium channels and rapid depolarization
3. inactivation of sodium channels and activation of potassium channels
4. Closing of potassium channels
Add Answer to:
indentify the correct sequence of steps in the generation of an
action potential?
1. activations of...
For each phase of an action potential, indicate the ion channel most responsible for the membrane...
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
The graph illustrates an action potential. Label when sodium and potassium channels are opening and closing....
The graph illustrates an action potential. Label when sodium and potassium channels are opening and closing. Answer Bank potassium channels open sodium channels open sodium channels close Membrane potential (mV) Rest potential potassium channels close Time (ms)
Help! What might be the "stimulus" that initiates the action potential? Incorrect Question 10 0/1 pts...
Help! What might be the "stimulus" that initiates the action
potential?
Incorrect Question 10 0/1 pts Action potential +40 Voltage (mv) 5 Stimulus 1 4 2 3 Time (ms) What might be the "stimulus" that initiates the action potential? the activty of sodium/potassium ATPase the activty of calcium ATPase the activity of potassium ion channels the activity of ligand gated channels the activity of sodium ion channels
Question 4 2 pts During and action potential, sodium (Na+) rushes into the cell causing of...
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...
Which statements describe the action potential in cardiomyocytes (heart muscle cells)? Depolarization stimulates voltage-gated, slow calcium...
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.
If necessary, refer to Animation: Chemical Synapses. When an action potential reaches the axon terminal: sodium...
If necessary, refer to Animation: Chemical Synapses. When an action potential reaches the axon terminal: sodium ions are released from the axon terminal, enter the cell body of the postsynaptic neuron through its sodium channels, and may initiate an action potential in that neuron. neurotransmitter molecules are released from the axon terminal and bind to receptors on the postsynaptic neuron, causing either an inhibitory hyperpolarization or an excitatory depolarization. neurotransmitter molecules are released from the axon terminal, bind to and...
The depolarization phase of the action potential of skeletal muscle cells ends when the ? a....
The depolarization phase of the action potential of skeletal muscle cells ends when the ? a. Na+ activation gates close. B. Na+ activation gates open. c. Na+ inactivation gates close. d. Na+ inactivation gates open. e. K+ voltage gated channels open. What is the correct choice.
Please answer question According to the plot of an action potential, select the answer that is...
Please answer question
According to the plot of an action potential, select the answer that is false. Membrane Potential (mv) The voltage gated sodium channel is inactivated at time point 3. The membrane is repolarizing at time point 3. Voltage gated potassium channels are open at time point 4. The membrane cannot undergo another action potential at time point 4. The voltage gated sodium channels are closed at time point 2.
Cell # 1 forms an excitatory synapse onto cell # 2 , when cell #1 fires a single action potential...
Cell # 1 forms an excitatory synapse onto cell # 2 , when cell #1 fires a single action potential it releases glutamate onto the membrane of cell #2 resulting in a 5 millivolt depolarization, a 5 mV excitatory postsynaptic potential, when cell #1 fires three action potentials in rapid succession this causes a 15 mV depolarization in cell #2 resulting in cell #2 reaching threshold and firing its own action potential. Cell #1 Cell #2 +40 Vm IN Cell...
Choose best answer 1. The primary movement of ions across the sarcolemma during an action potential...
Choose best answer 1. The primary movement of ions across the sarcolemma during an action potential that stimulates a skeletal muscle fiber to contract is: a. sodium inward and potassium outward b. sodium outward and potassium inward c. both sodium and potassium inward d. both sodium and potassium outward 2. The chemical substance that transmits the electrical impulse from the alpha motor neuron to the sarcolemma of the muscle fiber is: a. norepinephrine b. adrenalin c. beta-endorphin d. acetylcholine 3....
The graph illustrates an action potential. Label when sodium and potassium channels are opening and closing. Answer Bank potassium channels open sodium channels open sodium channels close Membrane potential (mV) Rest potential potassium channels close Time (ms)
Help! What might be the "stimulus" that initiates the action
potential?
Incorrect Question 10 0/1 pts Action potential +40 Voltage (mv) 5 Stimulus 1 4 2 3 Time (ms) What might be the "stimulus" that initiates the action potential? the activty of sodium/potassium ATPase the activty of calcium ATPase the activity of potassium ion channels the activity of ligand gated channels the activity of sodium ion channels
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...
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.
Please answer question
According to the plot of an action potential, select the answer that is false. Membrane Potential (mv) The voltage gated sodium channel is inactivated at time point 3. The membrane is repolarizing at time point 3. Voltage gated potassium channels are open at time point 4. The membrane cannot undergo another action potential at time point 4. The voltage gated sodium channels are closed at time point 2.
Cell # 1 forms an excitatory synapse onto cell # 2 , when cell #1 fires a single action potential it releases glutamate onto the membrane of cell #2 resulting in a 5 millivolt depolarization, a 5 mV excitatory postsynaptic potential, when cell #1 fires three action potentials in rapid succession this causes a 15 mV depolarization in cell #2 resulting in cell #2 reaching threshold and firing its own action potential. Cell #1 Cell #2 +40 Vm IN Cell...
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