Q5.5. Why do neurons generate an action potential, instead of simply relying on the opening of ion channels near the stimulus site to transmit information? Because, without the action potential, changes in Vm at the stimulus site might not reach the axon terminal Because without the action potential, the neuron would not depolarize Because action potentials help the body keep ion concentrations at appropriate levels Because, without the action potential, the neuron would not return to resting potential Submit

Q5.5. Why do neurons generate an action potential, instead of simply relying on the opening of ion channels near the stimulus site to transmit information? Because, without the action potential, changes in Vm at the stimulus site might not reach the axon terminal Because without the action potential, the neuron would not depolarize Because action potentials help the body keep ion concentrations at appropriate levels Because, without the action potential, the neuron would not return to resting potential Submit

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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answer for 14, 17
Pls help ASAP
Explain in few sentences !! how a neuron can repair itself. What increases the likelihood of repair; what decreases the likelihood of repair? If repair is not possible, what other options are possible to innervate the effector organ?
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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
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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
8,9 and 10 if possible
My question is how can spatial summation of synaptic potentials make it easier for a neuron to reach action potential threshold?
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
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