Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 42.3, Problem 2CS
Summary Introduction
To sketch: The graph showing a change in the potential of a neuron when it simultaneously receives a strong depolarizing and equally strong hyperpolarizing stimulus or a strong depolarizing and a weak hyperpolarizing stimulus.
Introduction: Nerves carry the messages from the central nervous system to the muscles and other organs. The messages are carried by the nerves in the form of electrical impulses. The signals that reach the cell body stimulate the neuron to generate its own signal in the form of the action potential and relay it to the next neuron or the effector organs. Na+ and K+ play a significant role in the development of the action potential across the membrane.
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Subject: Neurophysiology
The neuron for this experiment is in a bath with [K+] = 2 mM and [Na+] = 150 mM.
Calculate the Nernst Equilibrium potential for each ion.
What is your estimate for the gNa and for gK? If you are more comfortable, use PNa and PK. Remember, these values should be between 0 and 1.
What is the resting membrane potential for this cell?
Draw an action potential for this neuron in this solution. Keep in mind that this neuron is in unusual solutions. Label each axis and indicate inward and outward currents. Be absolutely certain to label the peak voltage and threshold for the AP!
Pls help ASAP
Chapter 42 Solutions
Biology
Ch. 42.1 - Prob. 1CCCh. 42.2 - Prob. 1CSCh. 42.3 - Prob. 1CSCh. 42.3 - Prob. 2CSCh. 42.3 - Prob. 1CCCh. 42.3 - Prob. 2CCCh. 42.4 - What key prior observation led Loewi to develop...Ch. 42.4 - CoreSKILL The results of Loewis experiment...Ch. 42.4 - Prob. 3EQCh. 42 - Prob. 1TY
Ch. 42 - Prob. 2TYCh. 42 - The myelin sheath a. is produced by neurons in the...Ch. 42 - Prob. 4TYCh. 42 - Prob. 5TYCh. 42 - Which of the following contribute(s) to the...Ch. 42 - Prob. 7TYCh. 42 - Prob. 8TYCh. 42 - Prob. 9TYCh. 42 - Prob. 10TYCh. 42 - Prob. 1CQCh. 42 - Prob. 2CQCh. 42 - Prob. 3CQCh. 42 - Describe the difference between an electrical...Ch. 42 - Prob. 2COQ
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- a. Define threshold potential. b. One student commented that the threshold potential for this muscle fibre is exactly 50 mV. Do you agree or disagree? Why or why not?arrow_forwardvoltmeter microelectrode electrode Giant squid axon A voltmeter was used to measure the potential difference across the cell membrane of a giant squid axon. Which of the following best explains the voltmeter reading? Select one: a. The threshold potential has not been reached. b. The sodium potassium exchange pumps are working to take out the sodium ions and bring in the potassium ions. c. The potassium ions have rushed out of the axon, and the potassium channels are slow to shut down. d. The sodium ions have rushed into the axon, and the sodium channels are closing.arrow_forwardInhibitory post synaptic membrane potential - Data Cl- Cl- Nr of GABA inside Max Postsynaptic Voltage (mV) outside receptors 140 20 hel-89- 00 140 20 - 34.428 140 40 - ףQLL-b Questions 11. What is an IPSP? 12. GABA receptors on the postsynaptic neuron function as ion channels for which ion? 13. Based on the data collected, when is it more possible for an action potential to occur? When the intracellular Cl- concentration in the postsynaptic neuron increases or when the number of GABA receptors on the postsynaptic membrane increases? 14. Explainarrow_forward
- Question B)arrow_forwardDiscuss the importance of threshold. How does this relate to the concept of APs being all or none? Can I get help on this specific question?arrow_forwardmembrane potential -70mV time Which of the statements below describe a situation in which the change in membrane potential above could cause the firing of an action potential? Select all that apply. If the potential is counteracted by an IPSP. If the neuron is in the relative refractory period. If the potential is strong enough to bring the axon hillock to threshold. If the potential is supplemented by a simultaneous (or near- simultaneous) EPSP.arrow_forward
- Graph of membrane potential versus time The graph above represent time in milliseconds. At what time (in milliseconds) is the inside of the neuron the most positive and why? Explain why the membrane potential changes at X. Explain what is happening at point C to the sodium and potassium ions and how this is affecting the membrane potential. Describe two things that contribute to the resting membrane potential.arrow_forwardWhat happens to membrane potential during manipulation 4 in the attached figure (Figure 4.13 of the textbook)? 1 Efflux of Nat Nat efflux (logarithmic scale) 0 3 Recovery when K+ is restored 2 Nat efflux reduced by removal of external K 50 100 4 Efflux decreased by metabolic inhibitors, such as dinitrophenol, which block ATP synthesis 150 Time (min) 200 5 Recovery when ATP is restored " I 250 TATI 122 O Membrane potential does not change, because the Na+-K+ ATPase does not contribute to membrane potential. O Membrane potential is hyperpolarized, because the Na+-K+ ATPase is electrogenic and hyperpolarizes membrane potential when it is active. O Membrane potential is depolarized, because the Na+-K+ ATPase is electrogenic and hyperpolarizes membrane potential when it is active. 300arrow_forwardPlease asaparrow_forward
- Remaining Time: 1 hour, 16 minutes, 05 seconds. Qu B BIUS Paragraph V Arial P 田 心田 V 10pt X2 X2 # A = K7 ヒン V V V A V V T +] ABC V r T " Π 99 Ω € + QUESTION 27 What is the correct time-span for each stage in the "information processing model"? For each of the stages (sensory, short-term, and long- term), choose letter A, B, or C. Sensory Long-term memory Short-term (or working) memory A. Days to Years B. 1-2 seconds C. 30 seconds to several minutes QUESTION 28 Which one below does not describe the meaning of "episodic memory? This refers to remembering events and experiences at specific times and places. This refers to remembering the sequence of events and when things happened.arrow_forwardPls help ASAP on allarrow_forwardDescribe in detail how movement of ions causes a neuron to fire . Make sure to include how membrane potential is changed and which specific ions are moving in what directions to cause the firing .arrow_forward
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