Q8. The tips of neuronal axons communicate with other nerve cells by releasing small molecules calledneurotransmitters. These neurotransmitters need to cross a very tiny pocket of fluid to reach the next neuron;the distance is about 0.001 times the length of the smallest axon in this lab. Could this happen throughdiffusion?Yes, because the neurotransmitters will want to reach their target neuron on the other side of the fluid pocketYes, because the neurotransmitters are at high concentration near the diffusing axon and at low concentrationnext to the receiving neuron.No, because diffusing any distance takes a very long time, and neural communication has to happen rapidly.No, because diffusion does not work within very small spaces, only in large areas where there is room for themolecules to move.

The synapse is the junction where two neurons communicate with each other. The message is send from…

Q8. The tips of neuronal axons communicate with neurotransmitters. These neurotransmitters need t the distance is about 0.001 times the length of the diffusion? Yes, because the neurotransmitters will want to re Yes, because the neurotransmitters are at high ca next to the receiving neuron.

Q8. The tips of neuronal axons communicate with neurotransmitters. These neurotransmitters need t the distance is about 0.001 times the length of the diffusion? Yes, because the neurotransmitters will want to re Yes, because the neurotransmitters are at high ca next to the receiving neuron.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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What is an average range of millivolt difference between resting membrane potential and threshold potential? 150-300mV 1-2mV 0.005-500mV 15-30mV
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7. A neuron with an intracellular Cl concentration of 20 mM is placed in a solution that contains 125 mM CI at 25°C. The membrane potential of the neuron is -70 mV. Assuming the neuronal cell membrane has channels that allow facilitated diffusion of Clr, do you expect Cl to flow into the cell? Explain your answer and provide quantitative support for your answer (i.e. show calculations).
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Q4.6. If calcium ions, each of which has a charge of +2 (Ca2*), moved OUT OF a neuron, and no other ions were moving, what would be TRUE? The area outside the neuron would be become more negatively charged. The concentration of Ca2* inside the cell would increase. The neuron would become more negative. The neuron would become more positive.
Q5.6. If calcium ions, each of which has a charge of +2 (Ca²+), moved INTO a neuron, and no other ions were moving, what would be TRUE? The area outside the neuron would be become more positively charged. The concentration of Ca²+ inside the cell would decrease. The neuron would become more negative. The neuron would become more positive. Submit
9. You are performing an experiment at with an artificial membrane (i.e not a living cell). You place a NaCl solution on each side of the membrane. You discover that if you place a 10-fold NaCl concentration gradient across this membrane (higher NaCl concentration outside than inside) you initially see a +20 mV membrane potential develop. If the Cl permeability is assigned a value of 1, what value would you assign to the Na" permeability? Assume 2.3RT/F = 60 mV.
Q5.8. In a neuron with a Vm of 0, there is a high concentration of K* inside of the cell and a low concentration outside. Which statement below is TRUE? If K+ channels were open and the electrical forces were absent, diffusion would result in a net movement of K* out of the cell. If K+ channels were closed, Na* would flow into the neuron. If K+ channels were open and the effect of diffusion was absent, the electrical forces would move K+ out of the cell. The membrane potential would be at the K* equilibrium potential, because concentrations of K* are not balanced. Submit
22- For EPSP, which is the most important ion flow: A. Sodium ions diffuse out of the cell. C. Sodium ions diffuse into the cell. B. Potassium ions diffuse out of the cell. D. Potassium ions diffuse into the cell.
Q5.3. After the rising phase, which ion channel is responsible for action potential returning to its resting Vm, and why? Na+ channels, because positive Na* ions are at higher concentration outside the axon than inside, and so they enter the axon and raise V m Na* channels, because positive Na* ions are at higher concentration inside the axon than outside, and so they leave the axon and raise Im K* channels, because positive K* ions are at higher concentration outside the axon than inside, and so they enter the axon and raise Vm K+ channels, because positive K* ions are at higher concentration inside the axon than outside, and so they leave the axon and lower Vm Submit