It lacks voltage-sensitive sodium channels. Of Illinois, Urbana-Champaign Bio/Neuro 303 EXAM I Study Questions 107. Chemically gated sodium channels to open. Why is the leech model used for measuring the electrical activity of neurons instead of using humans? In a cell, the difference in ion concentration between the intracellular and extracellular fluids results from. Last modified: 20 Nov 2000 10:26. Which of the following was able to detect pressure? This is called electrochemical exclusion, meaning that the channel pore is charge-specific. The negative charge is localized in the large anions. In the brain, this then is interpreted as a stronger taste for instance. Timed with the peak of depolarization, the inactivation gate closes. Critical Thinking Questions. Resting membrane potential describes the steady state of the cell, which is a dynamic process that is balanced by ion leakage and ion pumping.
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Which of the following responded to a chemical stimulus? D. Leakage of K+ channels. To understand how neurons are able to communicate, it is necessary to describe the role of an excitable membrane in generating these signals. Stimuli such as odor molecules or taste molecules trigger receptor potentials in nerve cells. The sodium/potassium pump requires energy in the form of adenosine triphosphate (ATP), so it is also referred to as an ATPase. A receptor potential, a synaptic potential or an action potential. As the membrane potential repolarizes and the voltage passes -50 mV again, the channel closes—again, with a little delay.
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A glass microelectrode is applied by suction to a small area of cell membrane for study of the properties of individual ion channels. The Pacinian corpuscle and the free nerve ending. What is your feedback? Time after the initiation of an action potential when another action potential cannot be generated. A potential is a distribution of charge across the cell membrane, measured in millivolts (mV). In this analogy, the stimulus represents the force applied to the trigger while the firing of the gun represents the action potential.
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They must travel long distances without decrement. Increasing the duration of the stimulus. When myelination is present, the action potential propagates differently. Which fibers generate the smallest value for conduction velocity? C. produce a very small action potential. See Our Editorial Process Meet Our Review Board Share Feedback Was this page helpful? In neurons, a voltage clamp device is used to measure a. the resting membrane potential. The current flowing out of the cell only. View this animation to really understand the process. However, a slight difference in charge occurs right at the membrane surface, both internally and externally. As the membrane potential reaches +30 mV, other voltage-gated channels are opening in the membrane. D. increasing the number of voltage-gated sodium channels. The conducting region of the neuron is the _______. A third type of channel that is an important part of depolarization in the action potential is the voltage-gated Na+ channel.
Also, the concentration of K+ inside the cell is greater than outside. They vary with the intensity of the stimulus. D. An ionic current completes the local circuit as cations move toward the locus of the action potential and anions move away. The result of this then is that more nerve impulses are propagated and sent to the brain. Visit this site to see a virtual neurophysiology lab, and to observe electrophysiological processes in the nervous system, where scientists directly measure the electrical signals produced by neurons. Increased Na+ conductance --> decreased K+ conductance --> increased K+ conductance and Na+ inactivation --> depolarization. 00 \mathrm{mmol}$ of the acid will be titrated with $\mathrm{NaOH}(\mathrm{aq})$ to a final volume of about $100 \mathrm{~mL}$ at the equivalence point. The time interval for conduction would be shortest with. E. They mediate immune responses in neurons. The rate with which an action potential travels along an axon _______.
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