AP PSYCHOLOGY

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BIOLOGICAL BASES OF BEHAVIOR

NEUROTRANSMISSION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
As potassium gates open, the transmembrane potential changes rapidly as positive charges leave the neuron. In fact, an over abundance of potassium flows out to cause hyper-repolarization. At this time, another action potential cannot occur.
A
True
B
False
C
Either A or B
D
None of the above
Explanation: 

Detailed explanation-1: -A set of voltage-gated potassium channels open, allowing potassium to rush out of the cell down its electrochemical gradient. These events rapidly decrease the membrane potential, bringing it back towards its normal resting state.

Detailed explanation-2: -The flow of potassium ions out of the cell results in a decrease in membrane potential towards the cell’s resting voltage.

Detailed explanation-3: -During repolarization, potassium ions move out of the cell via potassium channels. This movement is down the concentration gradient to restore the charges across the cell membrane.

Detailed explanation-4: -How will this affect the membrane potential? The membrane potential will become more negative. If K+ ions are moving from the inside to the outside of the cell, then the inside of the cell is becoming more negative (since positive charge is leaving). So, the resting potential becomes more negative.

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