[Campbell Biology P.1128] The axon hillock is critical for neuronal integration. Which statem... | Practice Question
The axon hillock is critical for neuronal integration. Which statement best explains its role in generating an action potential?
A: It is the primary site for neurotransmitter release into the synaptic cleft.
B: It is where all excitatory and inhibitory postsynaptic potentials are summed, and if the membrane potential reaches threshold, an action potential is initiated.
C: It is responsible for producing individual subthreshold EPSPs that then spread to other parts of the neuron.
D: It solely amplifies individual postsynaptic potentials to ensure they reach the dendrites.
Explanation
The axon hillock serves as the neuron's integrating center, where all incoming excitatory and inhibitory postsynaptic potentials are summed. If this summed potential reaches a specific threshold, it triggers an action potential that then propagates down the axon.