Voltage-gated calcium channels do not contribute to maintaining low levels of calcium in resting nerve cells.

Here's why:

1. Voltage-gated calcium channels: These channels are closed in resting nerve cells, meaning they do not allow calcium ions to flow into the cell. They only open when the cell membrane is depolarized, which happens when the nerve cell is activated. Therefore, they do not contribute to maintaining low levels of calcium in resting nerve cells.

2. The plasma membrane calcium ATPase: This is an enzyme that uses energy from ATP to pump calcium ions out of the cell. This helps to maintain low levels of calcium in the cell.

3. The smooth endoplasmic reticulum calcium ATPase: This is another enzyme that uses energy from ATP to pump calcium ions into the smooth endoplasmic reticulum, a storage organelle within the cell. This also helps to maintain low levels of calcium in the cell.

4. Mitochondria: These organelles can take up calcium ions from the cytoplasm, helping to maintain low levels of calcium in the cell.

So, out of these four options, voltage-gated calcium channels do not contribute to maintaining low levels of calcium in resting nerve cells.

Question

Voltage-gated calcium channels do not contribute to maintaining low levels of calcium in resting nerve cells.

Here's why:

1. Voltage-gated calcium channels: These channels are closed in resting nerve cells, meaning they do not allow calcium ions to flow into the cell. They only open when the cell membrane is depolarized, which happens when the nerve cell is activated. Therefore, they do not contribute to maintaining low levels of calcium in resting nerve cells.

2. The plasma membrane calcium ATPase: This is an enzyme that uses energy from ATP to pump calcium ions out of the cell. This helps to maintain low levels of calcium in the cell.

3. The smooth endoplasmic reticulum calcium ATPase: This is another enzyme that uses energy from ATP to pump calcium ions into the smooth endoplasmic reticulum, a storage organelle within the cell. This also helps to maintain low levels of calcium in the cell.

4. Mitochondria: These organelles can take up calcium ions from the cytoplasm, helping to maintain low levels of calcium in the cell.

So, out of these four options, voltage-gated calcium channels do not contribute to maintaining low levels of calcium in resting nerve cells.

Knowee AI · Accepted Answer

Voltage-gated calcium channels do not contribute to maintaining low levels of calcium in resting nerve cells.

Here's why:

1. Voltage-gated calcium channels: These channels are closed in resting nerve cells, meaning they do not allow calcium ions to flow into the cell. They only open when the cell membrane is depolarized, which happens when the nerve cell is activated. Therefore, they do not contribute to maintaining low levels of calcium in resting nerve cells.

2. The plasma membrane calcium ATPase: This is an enzyme that uses energy from ATP to pump calcium ions out of the cell. This helps to maintain low levels of calcium in the cell.

3. The smooth endoplasmic reticulum calcium ATPase: This is another enzyme that uses energy from ATP to pump calcium ions into the smooth endoplasmic reticulum, a storage organelle within the cell. This also helps to maintain low levels of calcium in the cell.

4. Mitochondria: These organelles can take up calcium ions from the cytoplasm, helping to maintain low levels of calcium in the cell.

So, out of these four options, voltage-gated calcium channels do not contribute to maintaining low levels of calcium in resting nerve cells.

Which of the following does not contribute to maintaining low levels of calcium in resting nerve cells?Group of answer choicesVoltage-gated calcium channelsThe plasma membrane calcium ATPaseThe smooth endoplasmic reticulum calcium ATPaseMitochondria

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