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 the first question, let's break down the events and find the correct sequence:
Event 1: Positive ions flow into the neuron.
This event describes depolarization, which is the first step in nerve impulse transmission.
Event 3: The cell membrane becomes more permeable to Na+ than to K+.
This event further contributes to depolarization as more sodium ions enter the neuron.
Event 4: More positive ions accumulate on the outside than on the inside of the neuron.
This event is also a part of depolarization, as the accumulation of positive ions outside the neuron further disrupts the resting potential.
Event 5: The ion pumps transport Na+ out of the neuron and K+ into the neuron.
This event signifies repolarization, where the neuron returns to its resting state by transporting sodium ions out and potassium ions into the neuron.
Event 2: The resting potential of the cell membrane is restored.
This event represents the restoration of the resting membrane potential, marking the completion of one nerve impulse.
Using these explanations, we can determine the correct sequence of events:
a) 1,3,4,5,2
b) 1,5,3,4,2
c) 4,3,1,5,2
d) 4,5,3,4,2
Based on the explanations, the correct answer is c) 4,3,1,5,2.
Now, let's move on to the second question. We need to identify which events describe polarization, depolarization, and repolarization respectively:
Event 1: Positive ions flow into the neuron.
This event corresponds to depolarization.
Event 4: More positive ions accumulate on the outside than on the inside of the neuron.
This event is also a part of depolarization.
Event 2: The resting potential of the cell membrane is restored.
This event refers to repolarization as the cell membrane returns to its resting state.
Based on these explanations, the correct answer is d) 4,5,1, which represents the events that describe polarization, depolarization, and repolarization respectively.
So, your correct answers are:
1. The correct sequence is c) 4,3,1,5,2.
2. The correct events for polarization, depolarization, and repolarization are d) 4,5,1.