Physioex 9.0 Laboratory Review 03-09

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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.

Experiment Results Predict Question:

Predict Question 1: If you apply a very weak, subthreshold stimulus to the sensory receptor Your answer : a. a small, depolarizing response will occur at R1, and no responses will occur at R2, R3, and R4.

Predict Question 2: If you apply a moderate stimulus to the sensory receptor Your answer : b. a small, depolarizing response will occur at R1 and R2, and action potentials will occur at R3 and R4.

Predict Question 3: If you apply a strong stimulus to the sensory receptor Your answer : a. a large, depolarizing response will occur at R1 and R3, and action potentials will occur at R2 and R4.

Stop & Think Questions: Observe the two neurons in the petri dish. What do you think is the resting membrane potential at the receiving end of the sensory neuron (sensory receptor) and the receiving end of the interneuron? You correctly answered: c. -70 mV

Why is there no response at R3 when you apply a...
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