Please help! The following diagram shows that: a. changing external sodium and p
ID: 92326 • Letter: P
Question
Please help!
The following diagram shows that: a. changing external sodium and potassium had identical effects on the resting axon potential. b. increasing potassium outside the axon hyperpolarized the axon's potential. c. increasing potassium outside the axon triggers an action potential. d. increasing potassium outside the axon does not change the axon's potential. e. increasing potassium outside the axon depolarized the axon's potential. The resting potential of a neuron is produced by a. voltage-gated channels in the membrane. b. chemically gated channels in the membrane. c. permanently open potassium channels in the membrane. d. the concentration difference in Na^+ across the membrane. e. blockage of the sodium-potassium pump. Based on the diagram, the resting membrane potential is not exactly equal to the Nernst potential for potassium because a. the Nernst equation is not able to predict potentials that precisely. b. rapid fluctuations in membrane potential prevent accurate measurements. c. potassium is the only contributor to the resting membrane potential. d. Ca++, K+ and Na+ contribute to the membrane potential. e. All of the aboveExplanation / Answer
1. ) INCREASING POTTASIUM OUTSIDE THE AXON HYPERPOLARISED THE AXON'S POTENTIAL.
THEREFORE ANSWER IS "b"
EXPLAINATION
priorly to this stage there is an faster efflux of K+ takes place which results in negative charge inside the cell., but in this stage there is decrease in efflux of K+ i.e less negative charge inside the cell or relatively positive charge , on the other hand influx of Na+ also taking place, hence noth these conditions leads to HYPERPOLARIZATION.
B) VOLTAGE GAITED CHANNELS IN THE MEMBRANE.
therefore correct answer is "A"
EXPLANATION
resting membrane potential is maintained by Na+ -- K+ pumps which are electrogenic in nature that is they produced charge imbalance across the cell membrane and directly leads to membrane potential.