Review Sheet Results
1. Sensory neurons have a resting potential based on the efflux of potassium ions (as demonstrated in Activity 1). What
passive channels are likely found in the membrane of the olfactory receptor, in the membrane of the Pacinian corpuscle,
and in the membrane of the free nerve ending?
Your answer:
The efflux of potassium is key factor of resting potential. So there will be potassium channel.
2. What is meant by the term graded potential?
Your answer:
Graded potential is changes of membrane potential out of resting potential in a short duration. It can cause depolarizing.
3. Identify which of the stimulus modalities induced the largest amplitude receptor potential in the Pacinian corpuscle. How
well did the results compare with your prediction?
Your answer:
The moderate-intensity pressure modality causes a receptor potential in the pacinian corpuscle as predicted.
4. Identify which of the stimulus modalities induced the largest amplitude receptor potential in the olfactory receptors. How
well did the results compare with your prediction?
Your answer:
The moderate intensity chemical modality causes a receptor potential in the olfactory receptors.
5. The olfactory receptor also contains a membrane protein that recognizes isoamylacetate and, via several other
molecules, transduces the odor stimulus into a receptor potential. Does the Pacinian corpuscle likely have this
isoamylacetate receptor protein? Does the free nerve ending likely have this isoamylacetate receptor protein?
Your answer:
Free nerve ending and the Pacinian corpuscle do not contain the isoamylacetate receptor protein because they did not
show response to the the odor stimulus.
6. What type of sensory neuron would likely respond to the green light?
Your answer:
Optic sensory neuron will respond to green light. This sensory neuron may have receptor protein that respond to light.