Explain where the largest concentration of sodium channels is found on a neuron. Explain why the...

Explain where the largest concentration of sodium channels is found on a neuron. Explain why the action potential signal travels down the axon towards the synaptic terminals.

Solutions

Expert Solution

Axon Hillock has the largest concentration of sodium channels in a neuron. It is specialised part of the cell body of neuron and connects to axon.

When neurotransmitters from the presynaptic neuron bind to dendrites of post synaptic neuron, ligand gated sodium channel opens. It causes influx of sodium and thus the depolarization. However, it may decrease exponentially with distance and time when passing through axon. Now If many such depolarization reaches postsynaptic neuron in short time, then it leads to opening of voltage gated sodium channels which helps in generation of action potential. These sodium channels are concentrated in large amount in Axon Hillock and initial segment of neuron. Thus, they have a greater role in generation of action potential. It is unidirectional transmission as previous region remains in absolute refractoriness. So it has to travel in a single direction down the axon to synaptic terminal.

Sydney Mullin answered 10 months ago

Next > < Previous

Related Solutions

12. The calcium channels are found in the axon terminal end of the neuron (True/False): _________...

12. The calcium channels are found in the axon terminal end of the neuron (True/False): _________ 13. During depolarization ___________ channels open and _______ ion rushes into the cell. 14. During repolarization _____________ channels open and ________ rushes out of the cell. 15. The resting membrane potential is restored by _________________. A. Na channel B. Calcium channel C. Potassium channel D. Na/K voltage gated channel Which of the following correctly describes a graded potential? a. long distance signaling b. intensity...

Tetrodotoxin is a molecule that blocks voltage-gated sodium ion channels. What would happen if a neuron...

Tetrodotoxin is a molecule that blocks voltage-gated sodium ion channels. What would happen if a neuron was exposed to tetrodotoxin? Specify the effect of tetrodotoxin on the communication capacity of a neuron. Give a detailed answer by describing the role of sodium ions in producing the action potential. Help please

20-25 Blocking sodium ion channels in a pain sensory neuron would likely: increase the pain a...

20-25 Blocking sodium ion channels in a pain sensory neuron would likely: increase the pain a person was experiencing increase the amount of neurotransmitter released at the synapse both a. and b. are correct neither a. nor b. is correct Arachnoid mater is: deep to pia mater superficial to dura mater part of the meninges none of the above is correct A branching network of nerves is called a: plexus synapse ganglion reflex arc Dermatomes are: particular areas of skin...

For each of these 3 channels, describe where they are found, how they work, and the...

For each of these 3 channels, describe where they are found, how they work, and the role they play in physiology: 1) the cardiac ryanodine channel, 2) the voltage gated calcium channel on neurons, and 3) the dihydropyridine ryanodine channel

If the concentration of chloride is 10mM outside a neuron and 100mM inside the neuron, at...

If the concentration of chloride is 10mM outside a neuron and 100mM inside the neuron, at what voltage will there be no net movement of chloride through open chloride channels? 123 mV -32 mV 61.5 mV -61.5 mV

Describe the parts of a neuron. Explain how signals move through a neuron (include where they...

Describe the parts of a neuron. Explain how signals move through a neuron (include where they begin and where are they transmitted).

If a pre-synaptic neuron released a neurotransmitter onto a post-synaptic neuron and caused potassium (K+) channels...

If a pre-synaptic neuron released a neurotransmitter onto a post-synaptic neuron and caused potassium (K+) channels to open, what effect would this have on the post-synaptic neuron? A. the post-synaptic neuron would likely generate an inhibitory post-synaptic potential (IPSP) B. the post-synaptic neuron would likely generate an excitatory post-synaptic potential C. the post-synaptic neuron would likely release a neurotransmitter D. the post-synaptic neuron would likely produce an action potential

Briefly explain why Neuron A that receives similar types and strengths of synaptic input to Neuron...

Briefly explain why Neuron A that receives similar types and strengths of synaptic input to Neuron B, can have very different action potential shapes (i.e. waveforms) and action potential firing rate versus Neuron B. In your answer be sure to describe: (1) What aspects of the neuron’s composition determine this 'intrinsic excitability', (2) Which of these aspects are the most common components in these responses, and (3) Why a neuron might fire more action potentials if it is forced to...

Are voltage gated sodium channels, and voltage gated potassium channels considered secondary active transporters? If not...

Are voltage gated sodium channels, and voltage gated potassium channels considered secondary active transporters? If not then what are they called, and could you please explain what a secondary active transporter is and include a common example of one?

ACTION POTENTIAL (AP) ON A NEURON 1. For each of the following channels, indicate what specifically...

ACTION POTENTIAL (AP) ON A NEURON 1. For each of the following channels, indicate what specifically opens it, what specifically closes it, and what goes through (& in what direction) when it is open. •Voltage-gated Na+ channel •Voltage-gated K+ channel 2. What are leak channels? What purpose do they serve in neurons?

Subjects