WHEN A NEURON IS AT REST,
a. sodium ions are most concentrated inside the cell
b. potassium ions are most concentrated inside the cell
c. the outside of the cell is negatively charged.
d. both b and c
idk mayn i think D or A?????
At rest, 2 K+ flows into the cell and 3 Na+ ions flow outside the cell, both against their concentration gradient. Answer choice A and B are correct. Something is wrong with your answer choices.
When a neuron is at rest, the correct answer is d. both b and c.
At rest, a neuron maintains a resting potential. This means that there is a difference in the concentration of ions across the cell membrane.
Inside the cell, potassium ions (K+) are more concentrated, while outside the cell, sodium ions (Na+) are more concentrated. This concentration difference is established and maintained by the sodium-potassium pump, an active transport mechanism.
Additionally, the resting potential of a neuron is negative on the outside of the cell compared to the inside. This negative charge is due to the uneven distribution of ions and is referred to as the resting membrane potential.
So, when a neuron is at rest, both potassium ions being most concentrated inside the cell (option b) and the outside of the cell being negatively charged (option c) are correct. Therefore, the correct answer is d. both b and c.
To determine the correct answer among the given options, we need to understand the resting state of a neuron and the distribution of ions across the cell membrane.
During the resting state of a neuron, it is not firing any signals or transmitting impulses. At this state, the inside of the neuron is slightly negatively charged compared to the outside. This difference in electrical charge is referred to as the resting membrane potential.
The resting membrane potential is mainly maintained by the distribution of ions across the neuron's cell membrane. At rest, the concentration of sodium ions (Na+) is higher outside the neuron, while the concentration of potassium ions (K+) is higher inside the neuron. This ion distribution is established and maintained by the activity of ion channels and pumps in the cell membrane.
So, looking at the options provided:
a. Sodium ions are most concentrated inside the cell - This is incorrect. Sodium ions are predominantly found outside the neuron at rest.
b. Potassium ions are most concentrated inside the cell - This is correct. Potassium ions are primarily found inside the neuron at rest.
c. The outside of the cell is negatively charged - This is also correct. During the resting state, the negative charge inside the neuron is responsible for creating a positive charge outside, resulting in a negatively charged exterior.
d. Both b and c - This option seems to be the correct answer. Potassium ions are mostly concentrated inside the cell, and the outside of the cell is negatively charged.
Therefore, the correct answer is option d, "both b and c."