Questions
Question 1
When sodium potassium pump moves sodium and potassium ions, the result is;
- More negative ions outside the cell.
- Equal number of positive and negative ions inside and outside the cell.
- More positive ions outside the cell.
- More positive ions inside the cell.
Question 2
Molecules that become ions in solutions contribute to membrane potential, as they are unevenly distributed across semipermeable membranes. These molecules include (Select all that apply).
- Salts
- Electrolytes
- Sugars
- Water
Question 3
Place the following steps in order from top to bottom.
- The resting membrane potential returns to -70 mV when the Na-K pump moves Na out and K into the cell.
- During depolarization, the sodium channels open and allow positive sodium ions to enter the negatively charged cell.
- During repolarization, potassium ions leave the cell, resulting in a negative internal charge of the cell.
Question 4
Which of the following ions has the greatest influence on the resting membrane potential?
- Potassium
- Phosphate
- Calcium
- Magnesium
- Chloride
Question 5
What is a contributing reason that the ions create a resting membrane potential?
- The Na-K pump causes three sodium ions leave the cell and two potassium ions enter the cell.
- Ions cannot pass through the cell membrane using simple diffusion.
- Gated Channels control when ions can pass through the cell membrane.
- All of the above are correct.
Question 6
Which of the following situations would result in a resting membrane potential? Select al that apply.
- 2 Potassium ions enter a cell, 2 sodium ions leave a cell.
- I chloride ion enters the cell, and 2 fluoride ions leave a cell.
- I chloride ion enters a cell, 1 potassium ion leaves the cell.
- 2 chloride ions enter a cell, and 2 fluoride ions leave a cell.
Question 7
Which of the following is true in regards to the Na-K pump?
- This causes depolarization of membranes.
- This causes repolarization of membranes.
- This establishes the resting membrane potential.
- All of the above.
Answers
Question 1
When sodium potassium pump moves sodium and potassium ions, the result is;
- More negative ions outside the cell.
- Equal number of positive and negative ions inside and outside the cell.
- More positive ions outside the cell.
- More positive ions inside the cell.
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