The following statement describes, in random order, events during the transmission of a nerve impulse. Use them to answer the next \g question(s).
Event 1: Positive ions flow into the neuron.
Event 2: The resting potential of the cell membrane is restored.
Event 3: The cell membrane becomes more permeable to Na+ than to K+.
Event 4: More positive ions accumulate on the outside than on the inside of the neuron.
Event 5: The ion pumps transport Na+ out of the neuron and K+ into the neuron.
1. Which order of events first describes the resting membrane and then the sequence of events as a nerve impulse occurs?
a) 1,3,4,5,2
b) 1,5,3,4,2
c) 4,3,1,5,2
d) 4,5,3,4,2
My answer is A
2. The events from the statement that describe polarization, depolarization, and repolarization respectively are
a) 1,4,2
b) 1,5,2
C) 4,1,2
d) 4,5,1
my asnwer is D
are these correct??
For question 1, the correct answer is actually option C) 4,3,1,5,2. This is because event 4 describes the accumulation of more positive ions on the outside than on the inside of the neuron, which represents the resting membrane potential. Then, event 3 describes the cell membrane becoming more permeable to Na+ than to K+, leading to depolarization. Event 1 follows, as positive ions flow into the neuron during depolarization. Event 5 represents the ion pumps transporting Na+ out of the neuron and K+ into the neuron, which helps restore the resting potential, described in event 2.
For question 2, the correct answer is indeed option D) 4,5,1. Event 4 represents the accumulation of more positive ions on the outside than on the inside of the neuron, which is polarization. Event 5 represents the ion pumps transporting Na+ out of the neuron and K+ into the neuron, which leads to depolarization. Finally, event 1 describes the positive ions flowing into the neuron, which represents repolarization.
So, your answer for question 1 is incorrect, but your answer for question 2 is correct.