Question

What determines whether a neuron initiates an action potential? Include the role of resting membrane potential, threshold, sodium, graded potentials, and the axon hillock. (answer in short answer pragraph form)

Answer 1

the net Change in postsynaptic membrane voltage determines whether the postsynaptic cell has reached its threshold of exitation needed to fire an action potential. If the neurononly receive excitatory impulses it will generate an action potential

• resting potential of neuron is controlled by the difference in total charge between the inside and outside the of the cell.

1. when the neuronal membrane is at rest, the resting potential is negative due to accumulation of more sodium ions outside the cell then the potassium ion
2. Potassium ion will diffuse out of the cell at a much faster then sodium ion. In to the cell
3. Reason behind is the neuron has more potassium leakage channels than sodium leakage
4. Na-k pump move 2 potassium ions inside the cell as three sodium ions are pumped out to maintain the negatively charged membrane in side the cell wallm
5. This helps to maintain the resting potential
6. 

axon hillock:-

the axon Aries from the soma at a region callee the axon hillock or its called initial segment.

here the palsma membrane genertaes nerve impulses. the axom conducts these impulses away from the soma.