3. In nervous system, electrical signals originating within one cell can diffuse into a neighbouring cell as chemical signals through . 4. The depolarization phase of action potentials in neurons is due primarily to flow into the cell (ion) 5. The all-or-none principle, associated with the action potential, states that once membrane potential reaches. an action potential will be generated and will be the same magnitude

3. In nervous system, electrical signals originating within one cell can diffuse into a neighbouring cell as chemical signals through . 4. The depolarization phase of action potentials in neurons is due primarily to flow into the cell (ion) 5. The all-or-none principle, associated with the action potential, states that once membrane potential reaches. an action potential will be generated and will be the same magnitude

Biology: The Dynamic Science (MindTap Course List)

4th Edition

ISBN:9781305389892

Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan

Chapter39: Information Flow And The Neuron

Section: Chapter Questions

Problem 16TYK

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Similar questions

Which of the following means the ability to transmit electrical current from one cell to another? A. Conductivity B. Excitability C. Contractility D. Automaticity
An example of a synapse could be the site where: a. neurotransmitters released by an axon travel across a gap and are picked up by receptors on a muscle cell. b. an electrical impulse arrives at the end of a dendrite causingions to flow onto axons of presynaptic neurons. c. postsynaptic neurons transmit a signal across a cleft to apresynaptic neuron. d. oligodendrocytes contact the dendrites of an afferent neurondirectly. e. an onoff switch stimulates an electrical impulse in apresynaptic cell to stimulate other presynaptic cells.
An action potential begins when ___ . a. a neuron reaches threshold potential b. voltage-gated potassium gates open c. voltage-gated .sodium gates dose d. sodium-potassium pumps stop operating
Which of the following does not contribute to propagation of action potentials? a. As the area outside the membrane becomes negative, itattracts ions from adjacent regions; as the inside of the membrane becomes positive, it attracts negative ions from nearby in the cytoplasm. These events depolarize nearby regions of the axon membrane. b. The refractory period allows the impulse to travel in only one direction. c. Each segment of the axon prevents the adjacent segments from firing. d. The magnitude of the action potential stays the same as it travels down the axon. e. Up to a limit, increasing the intensity of the stimulus increases the number of action potentials.
1. An action potential does occur in response to a _____ , which strong enough to depolarize the membrane to threshold.
1. The graph above represent time in milliseconds. At what time (in milliseconds) is the inside of the neuron the most positive and why? 2. Explain why the membrane potential changes at X 3. Explain what is happening at point C to the sodium and potassium ions and how this is affecting the membrane potential 4. Describe two things that contribute to the resting membrane potential
1.) In an experiment you artificially cut in half (~50% reduction) the number of voltage gated sodium channels that are located on the membrane of the axon hillock. Which of the following is the most likely result of this experimental manipulation? A. Summation of more IPSPs would be required for an action potential to occur B. This change would have no effect on the value required to reach threshold C. Even with a very large number of summating EPSPs it would be impossible for an action potential to occur D. The value to reach threshold would be higher (more positive) making it less likely for an action potential to occur E. All of the above statements are FALSE
Fill in the blank The all-or-none principle, associated with the action potential, states that once membrane potential reaches......... magnitude an action potential will be generated and will be the same
1. Now assume that you have a typical neuron that has very few Na+ channels open relative to the number of K+ channels. This is the condition of a neuron that is at rest. What will the resting membrane potential be? 2. Suppose a neuron’s resting potential is -70 mV. What will happen to the membrane potential if you could open more K+ channels open more Na+ channels
1.A poison causes a drastic rise inE value with stimulation of the membrane.Thereafter membrane is slow to return towards resting membrane potential and levels off several millivolts above the threshold potential. This poison has likely affect which feature of the membrane? a) voltage gated na+ channels. b) voltage gated K+ channels. c) Na+/K+ Atp pump 2. All cell membrane demonstrate action potential if stimulated enough? True/False. 3. how many peaks are there in a compound action potential? a)2. b)4 c)6 d)8 4. Increasing the ionic concentration in the salt bridge results in E value increase to a point after which it plateeus. This is evidence brownian movement at work in the ionic solution that is keeping from energy flowing through the bridge with the fidelity that is seen in the metal bridge? True/ False 5. All cell membrane demonstrate action potential if stimulated enough? True or False.
3. Explain all the electrical and mechanical events which occur during each measured wave, segment andinterval. An electrical event would be membrane polarization: depolarization, repolarization, restingmembrane potential, hyperpolarization etc; mechanical events include blood flow, open or closed valves,heart sounds, contraction, relaxation, pressure changes, etc. An example of a complete answer for the P waveis given below. Feel free to use your lecture and/or textbook as a reference to make the connections betweenECG and the cardiac cycle. This is a great way to review for the exam and apply what you are learning. P Wave – During the P wave, depolarization is sweeping from the SA node throughout both atria (electricalevent). This leads to the beginning of atrial contraction (mechanical event).PR Interval -P-R Segment –QRS Complex –Q-T Interval –S-T Segment –T Wave –T-P Segment –R-R Interval –
4. Which term describes the cell membrane potential of a neuron at rest? a. polarized b. depolarized c. hyperpolarized d. repolarized e. sympolarized