PhysioEx 9.0: Exercise 3 - Pre and post quizzes (Activity 9)

Exercise 3: Neurophysiology of Nerve Impulses: Activity 9: The Action Potential: Putting It All Together Lab Report
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1. Sensory neurons respond to an appropriate sensory stimulus with a change in membrane potential that is
You correctly answered: b. graded with the stimulus intensity.
2. If the depolarization that reaches the axon is large and suprathreshold, the result in the axon is
You correctly answered: c. action potentials at higher frequency.
3. At the axon terminal, each action potential causes the release of neurotransmitter. This neurotransmitter diffuses to the
receiving end of an interneuron, where it binds to receptors and causes
You correctly answered: a. ion channels to open, so that the receiving end of the interneuron depolarizes.
4. Interneurons respond to chemical (neurotransmitter) stimulation with a change in membrane potential that is
You correctly answered: b. graded with the stimulus intensity

Post-lab Quiz Results
You scored 100% by answering 5 out of 5 questions correctly.
1. What determines the amplitude of the depolarization at the sensory receptor (R1)?
You correctly answered: a. The strength of the stimulus applied to the sensory receptor.
2. What determines the frequency of action potentials in the axon of the sensory neuron (R2)?
You correctly answered: a. The amplitude of the depolarization at the sensory receptor (R1).
3. Which of the following directly determines the amount of neurotransmitter released at the axon terminal of the sensory
neuron?
You correctly answered: c. The amount of calcium that enters the sensory receptor.
4. Which of the following directly or indirectly determines the amount of neurotransmitter released at the axon terminal of
the sensory neuron?
You correctly answered: d. All of the above play a role in determining the amount of neurotransmitter released.
5. Which of the following directly or indirectly determines the frequency of action potentials in the axon of the interneuron?
You correctly answered: d. All of the above play a role in determining the frequency of action potentials in the axon of the
interneuron.