Understanding Neural Communication: IPSPs and Action Potentials

Very Hard Unit 2: Biological Bases Neural Communication

The process of neural communication is a complex interplay of various mechanisms. Understanding the role of neurotransmitters, receptors, and ion channels is vital to grasp how signals are transmitted between neurons. A neurotransmitter is released from the presynaptic neuron and binds to receptors on the postsynaptic neuron, leading to changes in the postsynaptic membrane potential. However, not all neurotransmitter binding results in excitation; some can inhibit the postsynaptic neuron. Consider the following question to test your understanding of these processes.

Inhibitory postsynaptic potentials (IPSPs) decrease the likelihood that a postsynaptic neuron will fire an action potential.

Excitatory neurotransmitters primarily cause hyperpolarization of the postsynaptic membrane.

Neurotransmitter reuptake involves the binding of neurotransmitters to the presynaptic neuron, increasing firing rates.

Action potentials are graded responses triggered by excitatory neurotransmitters alone.

All neurotransmitters have the same effect on postsynaptic neurons, either always exciting or inhibiting them.

Hint

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