Jiongxing Wu participated in study concept and design, and manuscript writing, put forward the ideas and wrote the manuscript.
During this time, some users may not be able to access the site. Our apologies for the inconvenience. How well did the results compare with your prediction? 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?
What is meant by the term graded potential?
Identify which of the stimulus modalities induced the largest well did the results compare with your prediction? Identify which of the stimulus modalities induced the largest-amplitude receptor potential in the olfactory receptor well did the results compare with your prediction?
The olfactory receptor also contains a membrane protein that recognizes isoamyl acetate and, via several other transduces the odor stimulus into a receptor potential.
Does the Pacinian corpuscle likely have this isoamyl acetate protein? Does the free nerve ending likely have this isoamyl acetate receptor protein? What type of sensory neuron would likely respond to a green light?
Define the term threshold as it applies to an action potential. What change in membrane potential depolarization or hyperpolarization triggers an action potential? How did the action potential at R1 or R2 change as you increased the stimulus voltage above the threshold well did the results compare with your prediction?
An action potential is an "all-or-nothing" event. Explain what is meant by this phrase. What part of a neuron was investigated in this activity? How does the effect of lidocaine differ from the effect of A nerve is a bundle of axons, and some nerves are less sensitive to lidocaine.
If a nerve, rather than an axon, had been in the lidocaine experiment, the responses recorded at R1 and R2 would be the sum of all the action potentials called a action potential.
Would the response at R2 after lidocaine application necessarily be zero?
Why or why next? How well did the result with your prediction? Why are fewer action potentials recorded at R2 when lidocaine is applied between R1 and R2?
How well did the results with your prediction? Pain-sensitive neurons called nociceptors conduct action potentials from the skin or teeth to sites in the brain pain perception. Where should a dentist inject the lidocaine to block pain perception?
Define inactivation as it applies to a voltage-gated sodium channel. Browse hundreds of Biology tutors.Show transcribed image text Explain why increasing extracellular K+ reduces the net diffusion of K+ out of the neuron through the K+ leak channels.
Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value%(5). The resting membrane potential will become less negative. There are more negative charges than positive charges just inside the membrane.
Changing the extracellular Na+ concentration does not significantly change the membrane potential. Experiment Data: Extracellular Fluid (ECF) Control Control.
increasing the extracellular K+ reduces the concentration gradient between extracellular fluid and ECF; so less K+ will want to diffuses out of the neuron. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value.
Mar 15, · The membrane potential of individual neurons can be influenced by extracellular fields, and conversely the transmembrane current of individual neurons can influence the extracellular field.
The electric fields are generated by neurons and glia in a cooperative manner. 2. Explain why increasing extracellular K+ causes the membrane potential to change to a less negative value. How well did the results compare with your prediction? Your answer: Increasing extracellular K+ causes the membrane potential to change to a less negative value because less K+ ions diffuse out.
As more K+ ions remains in, the charge will become less negative%(17). Extracellular fluid (ECF) Microelectrode position Voltage (mV) Control Cell body, extracellular 0 Explain why increasing extracellular K1 causes the membrane potential to change to a less negative value.