3. Biological Psychology

Neurons And Synapses — Quiz

Test your understanding of neurons and synapses with 5 practice questions.

Practice Questions

Question 1

A neuroscientist observes that a specific neuron consistently fires an action potential when stimulated by a weak presynaptic input, but only if that input is repeated rapidly in succession. Which of the following best explains this phenomenon?

Question 2

During the absolute refractory period, the voltage-gated sodium ($\text{Na}^{+}$) channels are inactivated. What is the physiological consequence of this inactivation?

Question 3

Consider a scenario where a novel psychoactive drug acts as an antagonist at postsynaptic GABA receptors. What would be the most likely effect on neural activity?

Question 4

Which of the following best explains why action potentials are considered 'all-or-none' events?

Question 5

During the repolarization phase of an action potential, the membrane potential rapidly returns to its resting state. This is primarily due to the efflux of which ion?