Question

In: Biology

what is the importance of the axon hillock?

what is the importance of the axon hillock?

Solutions

Expert Solution

  1. The axon hillock is a specialized part of the cell body (or soma) of a neuron that connects to the axon. Theaxon hillock is the last site in the soma where membrane potentials propagated from synaptic inputs are summated before being transmitted to the axon.
  2. The axon hillock is the last site in the soma where membrane potentials propagated from synaptic inputs are summated before being transmitted to the axon. For many years, it had been believed that the axon hillock was the usual site of action potential initiation, i.e. the trigger zone. It is now thought that the earliest site of action potential initiation is found just adjacent, in the initial (unmyelinated) segment of the axon.[1] However, the positive point, at which the action potential starts, varies between cells. It can also be altered by hormonal stimulation of the neuron, or by second messenger effects of neurotransmitters.
  3. The axon hillock also functions as a tight junction, since it acts as a barrier for lateral diffusion of transmembrane proteins, GPI anchored proteins such as thy1, and lipids embedded in the plasma membrane

Related Solutions

Describe the process of an impulse being propegated from the axon hillock to the axon terminus....
Describe the process of an impulse being propegated from the axon hillock to the axon terminus. (Expert answer only please. Thank you)
Describe the parts of the brain neuron including; the axon ; the dendrite ; what are...
Describe the parts of the brain neuron including; the axon ; the dendrite ; what are neurotransmitters? ;what are vesicles? ; describe the Synapse ; what is the function of receptors; what is the Action Potential; and explain synaptic reuptake
Region Function Protein Dendrite Soma Axon Axon terminal Complete the table above on the regions of...
Region Function Protein Dendrite Soma Axon Axon terminal Complete the table above on the regions of the neuron, their primary function(s), and a specific protein that supports that function. Explain your choice of protein.
What is the importance of simplification when discussing the building of models? What is the importance...
What is the importance of simplification when discussing the building of models? What is the importance of positive versus normative statements in economic thinking? What is the difference between the demand and quantity demanded? What are the positive and negatives of a price ceiling?
what is the importance of oxopiperazine
what is the importance of oxopiperazine
1. What is the importance of the TATA box and transcription factors 2.What is the importance...
1. What is the importance of the TATA box and transcription factors 2.What is the importance of initiation complex 3.why should tRNA be charged with N-formylmethionine or methionine, what would happen if the tRNA was not charged?
Explain how nervous signal transmission is propagated along the axon and what happens when the signal...
Explain how nervous signal transmission is propagated along the axon and what happens when the signal reaches its effector organ or tissue. In your discussion include a brief explanation of the refractory period. How can a signal be made stronger?
Identify the type of electrical events that occur at the axon and at the dendrite and...
Identify the type of electrical events that occur at the axon and at the dendrite and describe a characteristic feature of each.
What is the importance of the carnot cycle?What is it for?
What is the importance of the carnot cycle?What is it for?
What is B2B messaging. What are the importance
What is B2B messaging. What are the importance
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT