Dr. Brainy creates a nerve cell that is only permeable to Caesium ions (Cs+1) at rest.She measures that the concentration of Caesium is 400mM outside the cell andonly 50 mM inside the cell. She calculates the Equilibrium potential for Cs+¹ (Ecs) tobe +35 mV.If Dr. Brainy uses an electrode to briefly hyperpolarize the cell and then removes thestimulus. She notices that the membrane potential drifts back towards:0 mV+58 mV+15 mV+ 35 mV

Option a: This option is incorrect because This value signifies that there's no driving force for…

Answered: Dr. Brainy creates a nerve cell that is…

Biomedical Instrumentation Systems

1st Edition

ISBN:9781133478294

Author:Chatterjee

Publisher:Chatterjee

Chapter12: Electroencephalography And Emg Instrumentation

Section: Chapter Questions

Problem 3P

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Similar questions

Blocking chloride movement will result in a(n). (increase/decrease) in the overall probability of an action potential during spatial summation. WHY?
At the peak of the action potential, Vm is approximately -65 mV. Assuming normal intracellular and extracellular K+ concentrations (refer to the table), (1) calculate the driving force (in mV) that acts on K+ ions and (2) use the information obtained in part 1 to determine the direction in which K+ ions will flow (i.e., into the cell or out of cell)
a) Explain in detail what is occurring at stage A in the graph. (Be specific in terms of what's happening to the ion channels in your explanation if necessary!) b) What does this graph represent as a whole? Explain the main idea it portrays. +40| -70- A 1 2 4 Time/ms Potential Difference/mV B
Caffeine and nicotine have excitatory effects because they: reduce the threshold for excitation increase the threshold for excitation open potassium ion leakage channels open chemically-gated chloride ion channels close chemically-gated calcium ion channels ( explain deeply with step by step type the answer).
1) A 100-um diameter nerve axon has the following properties: rm = 2.5 x 104 ohm x cm, ri = 1 x 105 ohm/cm, r0 = 0, cm = 3 x 10-8 F/cm. The permeability to Cl- is very high and Cl- ions are at resting potential Vm. A steady inward current is injected into the axon resulting in a Vm of -110 mV at the site of current injection. If the Vm 3 mm from the site of injection is -94.5 mV, what is the resting Vm?
Reversal potential of ACh receptors is 0mV. Equilibrium potentials of Na* and K* are +60mV and -90mV, respectively. A. Calculate emf for Nat and K* at -30mV. B. Is ACh receptor current at -30mV inward or outward? Is it causing depolarization or hyperpolarization?
A True OUTSIDE CELL This cell is at rest. False INSIDE CELL C D T E
Discuss the concept of termination of neurotransmitter action by comparing the mechanisms by which acetylcholine and nitric oxide's actions are terminated. (a) Name the three primary mediators of purinergic receptors. (b) Which one of these mediators is sometimes used to treat supraventricular tachycardia? (c) Explain why the drug in (b) is considered safer than verapamil in the treatment of supraventricular tachycardia?
The following concentrations of Na+ and K+ ions: [Na+]o = 120 mM, [Na+]i = 6 mM,[K+]o = 2 mM, and [K+]i = 150 mM. Assuming that the further at the peak of the action potential, PK: PNa is 1 : 12. Calculate (Vm) at the peak of the action potential
2. a) sensation). the doctor decides to check the resting potential of her sensory nerves. The microelectrode is inserted and the intracellular potential is measured as -65 mv. What relative ionic concentrations are responsible for maintaining this membrane potential? A 47-year-old woman complains of paresthesis (tingling, pricking or burning a) [Na+ Jout > [Na+] in ; [K+]out > [K+]in b) [Na+ Jout > [Na+] in ; [K+]out [Ca2+]in d) [Na+ Jout [K+]in e) Active sodium potassium pump
Which of the following structures has activity like acetylcholine? HyC H-C HC NMeg NMey D]
which of the following would be true (more than one can be true)? a) summation of A and X would reach threshold b) summation of C and A would be a graded potential c) stimulation by A would depolarize cell d) stimulation by B would be a subthreshold depolarization e) summation of B and C would be a graded potential with the net value of 12 mV depolarization

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