← Biological Bases of Behavior – AP Psychology

AP Psychology Exam Sample Test

Try 5 free practice questions with instant feedback. See how ready you are.

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Sample Questions

Question 1

What is the function of the myelin sheath in a neuron?

Answer: The myelin sheath is a fatty layer that insulates the axon, speeding up the transmission of neural impulses.

Question 2

What is the all-or-nothing principle in neural firing?

Answer: A neuron either fires completely at full strength or does not fire at all; the size of the action potential does not vary with stimulus intensity.

Question 3

What occurs during the refractory period of a neuron?

Answer: The neuron cannot fire another action potential; it is resetting its resting potential by restoring the ion balance across the membrane.

Question 4

What is the difference between an excitatory and an inhibitory neurotransmitter?

Answer: Excitatory neurotransmitters increase the likelihood that the receiving neuron will fire an action potential, while inhibitory neurotransmitters decrease that likelihood.

Question 5

What is reuptake in synaptic transmission?

Answer: Reuptake is the process by which the sending neuron reabsorbs excess neurotransmitters from the synaptic cleft, ending their effect on the receiving neuron.