Which of the following is not a method by which the effects of neurotransmitters are terminated?​​

a. Reuptake into the presynaptic neuron

b. Diffusion away from the synaptic cleft and uptake by glial cells

c. Movement back to the cell body by retrograde axonal transport

d. Degradation by enzymes in the synaptic cleft

Video transcript

Hey, everyone. Let's take a look at this question together. When an action potential reaches the axon terminal, it depolarizes the membrane as a result. What occurs is it answer choice. A the voltage gated calcium channels open. Answer choice B the neurotransmitters are synthesized. Answer choice C the receptors shape changes or answer choice D the enzymes are degraded. Let's work this problem out together to try to figure out which of the following answer choices is the result of the membrane depolarizing. So in order to solve this question, we have to recall what we have learned about when an action potential reaches the axon terminal, causing the membrane to depolarize what occurs. And we know that when an action potential reaches the axon terminal, it triggers the depolarization of the membrane. And as a result of the depolarization of the membrane, the voltage gated calcium channels open, which the opening of those voltage gated calcium channels results in an influx of calcium ions which triggers the release of neurotransmitters from the cynic vesicles into the synaptic cleft. Therefore, when an action potential reaches the axon terminal, depolarizing the membrane, the voltage gated calcium channels open. So answer choice A is the correct answer. And all other answer choices are incorrect since they are not the direct result of the membrane depolarizing. I hope you found this video to be helpful. Thank you and goodbye.