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.
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.
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
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 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 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?
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 reaches its effector organ or
tissue. In your discussion include a brief explanation of the
refractory period. How can a signal be made stronger?