Q5.3. After the rising phase, which ion channel is responsible for action potential returning to itsresting 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 mNa* channels, because positive Na* ions are at higher concentration inside the axon than outside,and so they leave the axon and raise ImK* channels, because positive K* ions are at higher concentration outside the axon than inside, andso they enter the axon and raise VmK+ channels, because positive K* ions are at higher concentration inside the axon than outside, andso they leave the axon and lower VmSubmit

Answered: Q5.3. After the rising phase, which ion…

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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Question

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

Expert Solution

Step 1

Each and every cell in the body remains in the polarised state including axon of a neuron. This mainly occurs due to the operation of sodium potassium pump and potassium leak channels both of which causes the development of negative charge inside the membrane in comparison to outside and this is called resting membrane potential.