Homework Answers
Answer:
B) Slow Na+ Channels
explanation: Slow Na+ channels are present in the pacemaker cells that are leaky channels for sodium . these produces a current called funny current resulting in decrement in the resting membrane potential taking it towards the threshold level spontaneously.
The SA nodal cells have an unstable resting membrane potential that spontaneously depolarizes due to a pacemaker potential. This is caused by the “funny” Na+ current and a decrease in the conductance of the inward rectifier K+ channel.
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Part A The "pacemaker potential of pacemaker cells is produced by the opening of at the...
The plateau phase of the ventricular action potential is caused by O fast voltage-gated Ca2+ channels...
The plateau phase of the ventricular action potential is caused by O fast voltage-gated Ca2+ channels opening fast Nachannels opening O slow K* channels opening Oslow voltage-gated Ca2+ channels opening Submit Request Answer
There can be more than one answer. 33. Factors that contribute to the constantly depolarizing pacemaker...
There can be more than one answer. 33. Factors that contribute to the constantly depolarizing pacemaker potential include A. closing of the Funny type Na+ channels early during the pacemaker potential B. a brief opening of the T-type Ca2+ channels late during the pacemaker potential C. opening of the L-Type Ca2+ channels late during the pacemaker potential D. continued closing of K+ channels during the pacemaker potential E. none of the above
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....
During the pacemaker potential in pacemaker cells _____ through voltage gated channels A. Ions enter cells...
During the pacemaker potential in pacemaker cells _____ through voltage gated channels A. Ions enter cells down concentration and charge gradients B. Ions exit cells down concentration but with charge gradient C. Ions exit cells down concentration and charge gradients D. Ions enter cells down concentration but against charge gradient Please try to explain the reason,ty.
NEED HELP ASAP! I need to use this graph to answer the questions below. Need ASAP...
NEED HELP ASAP!
I need to use this graph to answer the questions below. Need
ASAP
1. Some snake venoms (produced by cobras and their relatives)
block the low voltage-gated, T-type Ca2+ channels on pacemaker
cells. On the appropriate axes above, draw a new trace of membrane
potential over time, showing how this venom will change membrane
potential and action potential frequency. Explain the channel
mechanics that underlie your answer.
2. Imagine that a grizzly bear begins chasing you. You...
Complete the Concept Map to describe ionic movement during action potentials in cardiac pacemaker and contractile...
Complete the Concept Map to describe ionic movement during
action potentials in cardiac pacemaker and contractile cells, and
trace the conduction pathway.
pacemaker cells K+ ions Ca2+ ions cardiac muscle fibers Na ions SA nodes AV nodes, Reset Help bundles, branches and Purkinje fibers rapidly depolarize due to influx of directly trigger atria to contract and activate enter plateau phase due to slow influx of repolarize due to efflux of directly trigger ventricles to contract and activate directly trigger atria...
Propagation of an action potential down an axon is produced by: capacitive depolarization produced by the...
Propagation of an action potential down an axon is produced by: capacitive depolarization produced by the current lowers the membrane potential regenerative increase in Na+ permeability depolarization due to opening of Na+ channels all of the above
1. What triggers the opening of each of the different channels: ligand-gated K+ channels, ligand-gated Na+...
1. What triggers the opening of each of the different channels: ligand-gated K+ channels, ligand-gated Na+ channels, ligand-gated Cl- channels, voltage-gated Na+ channels, voltage-gated K+ channels, voltage-gated Ca2+ channels. 2. What happens to membrane potential in the immediate area where the channel is located when the channel opens and ions flow through? 3. Since graded and action potentials happen in different locations on the neuron, explain what has to happen to link these different events together.
8. Indicate whether the following lead to Depolarization OR Hyperpolarization (1) Opening of K+ channels on...
8. Indicate whether the following lead to Depolarization OR Hyperpolarization (1) Opening of K+ channels on the post-synaptic membrane. (2) Opening of Cl- channels on the post-synaptic membrane. (3) Opening of Na+ channels on the post-synaptic membrane. 9. Indicate whether the following are Graded OR All-or-None responses. (1) Local potential (2) Action potential (3) EPSP (4) IPSP (5) End Plate Potential 10. True or False: Temporal summation of IPSPs increases the chance of having an action potential.
Compare and contrast the molecular events of the action potential in the pacemaker cells of the...
Compare and contrast the molecular events of the action potential in the pacemaker cells of the SA node to those in a ventricular (contractile) cardiomyocyte. Be sure to point out how these molecular events underlie the differences in the shapes of the two types of potentials and how these differences serve the difference in functions for these cell types.
The plateau phase of the ventricular action potential is caused by O fast voltage-gated Ca2+ channels opening fast Nachannels opening O slow K* channels opening Oslow voltage-gated Ca2+ channels opening Submit Request Answer
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....
NEED HELP ASAP!
I need to use this graph to answer the questions below. Need
ASAP
1. Some snake venoms (produced by cobras and their relatives)
block the low voltage-gated, T-type Ca2+ channels on pacemaker
cells. On the appropriate axes above, draw a new trace of membrane
potential over time, showing how this venom will change membrane
potential and action potential frequency. Explain the channel
mechanics that underlie your answer.
2. Imagine that a grizzly bear begins chasing you. You...
Complete the Concept Map to describe ionic movement during
action potentials in cardiac pacemaker and contractile cells, and
trace the conduction pathway.
pacemaker cells K+ ions Ca2+ ions cardiac muscle fibers Na ions SA nodes AV nodes, Reset Help bundles, branches and Purkinje fibers rapidly depolarize due to influx of directly trigger atria to contract and activate enter plateau phase due to slow influx of repolarize due to efflux of directly trigger ventricles to contract and activate directly trigger atria...
8. Indicate whether the following lead to Depolarization OR Hyperpolarization (1) Opening of K+ channels on the post-synaptic membrane. (2) Opening of Cl- channels on the post-synaptic membrane. (3) Opening of Na+ channels on the post-synaptic membrane. 9. Indicate whether the following are Graded OR All-or-None responses. (1) Local potential (2) Action potential (3) EPSP (4) IPSP (5) End Plate Potential 10. True or False: Temporal summation of IPSPs increases the chance of having an action potential.
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