Please asap with explanation How does the relationship between INa and IK change as the stimulus currentincreases? What happens with these currents at the threshold current?Voltage (mV)150-15-30INA (NA)Inj (nA)-45-60-750IK (NA)282420161222118406284000.8 F0-0.8-1.6-2.4-3.2-4odo011Burgundy=24.7Red=24.71220.50.40.30.20.10-0.102Blue initial current at 24.5 nAPurple= 24.623355557

The relationship between the sodium current (INa), the potassium current (IK), and the stimulus…

Answered: INA (NA) Inj (NA) 0.8 -0.8 -1.6 -2.4 0…

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter29: Neural Control

Section: Chapter Questions

Problem 3SA: Action potentials occur when ______. a. potassium gates close b. a stimulus pushes membrane...

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The resting membrane potential of a neuron or muscle cell is a. equal to the potassium equilibrium potential. b. equal to the sodium equilibrium potential. c. somewhat less negative than the potassium equilibrium potential. d. somewhat more positive than the sodium equilibrium potential. e. not changed by stimulation.
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A graded potential (a) decreases with distance from the point of stimulation. (b) spreads passively because of local currents. (c) may involve either depolarization or hyperpolarization. (d) a, b, and c are correct.
A bat is 100 ft. below and to the right of a moth, as shown in the diagram below. At this distance, the bat’s cry is faint and the moth can here the bat, but the bat cannot yet detect the moth. Which of the following statements is correct for the escape decision the moth will make? a. The right A2 fiber of the moth will fire faster than the left A2 fiber, causing the moth to spiral out of control to the left. b. The firing of the A1 fibers will not fluctuate with the beating of the moth’s wings, and the moth will assess that the bat is below it. c. Because of the distance between the moth and bat, the moth’s A2 fibers will not fire and as a consequence the moth will take no action to evade the bat. d. The right A1 fiber will fire faster than the left A1 fiber and the moth will maneuver it’s body until the firing rates are equal. e. None of these will occur f. a and c g. b and d
Calculate, or make a best estimate of, the unknown factors in the situations listed in Table 1. Table 1. Data for problem 1. To find Data (i) Ek [K+]out = 4 mM; [K+]in = 130 mM (ii) [Cl-]in [Cl-]out = 570 mM; ECl = -65 mV (iii) ECl [Cl-]out = 150 mM; [Cl-]in = 8 mM; in a mammal (iv) [Na+]in Overshoot of action potential = +35 mV; saline [Na+] = 112 mM (v) [K+]in Blood [K+] = 3.2 mM; undershoot of action potential = -87 mV (vi) ECa [Ca2+]out = 5.6 mM; free [Ca2+]in = 0.8 mM (vii) [K+]out [K+]in = 350 mM; Ek = -82 mV
During strenuous exercise, which of the following changes most infuences total peripheral resistance?A) Decreased blood viscosityB) Decreased sympathetic cholinergic activityC) Increased sympathetic adrenergic activity D) Vasodilation in skeletal muscle
Suppose that gated ion channels for Na+or Ca2+ opened in the plasma membrane of a muscle cell.The membrane potential of that cell would a. move toward the equilibrium potential for that ion. b. become less negative than the resting membrane potential. c. move farther away from the potassium equilibrium potential. d. all of these.
Voltage-gated K+ channel senses voltage across the plasma membrane and permits selective passage of K+ ions. True False
The magnitude of receptor potential in the stretch receptor of a crayfish: a) depends on how much the muscle is stretched b) would decrease as the muscle is stretched c) depends on the amount of neurotransmitter released d) is the same for all types of stimuli e) depends on the strength of in incoming action potential
9. Which of the following correctly describes the end plate potential (EPP)? A)It is primarily mediated by Na+ influx B)It is both a local potential in the end plate area of the muscle cell that allows the muscle cell to depolarize and it is primarily mediated by Na+ influx C)It is both a local potential in the alpha motor neuron that allows a cell to depolarize and it is primarily mediated by Na+ influx D)It is a local potential in the end plate area of the muscle cell that allows the muscle cell to depolarize E)It is a local potential in the alpha motor neuron that allows the muscle cell to depolarize
dendrotoxins, produced by the mamba snakes are inhibitors of the voltage gated k+ channel. what phase of the action potential with this toxin effect? how would it affect ion permeability during this phase howard ion movement be affected?
Why is it expected that input resistance and rheobase in a neuron would be very less correlated

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