Problem III: Below is a red blood cell suspended in plasma, the liquid component

Question

Problem III: Below is a red blood cell suspended in plasma, the liquid component (ECF) of blood. The average normal concentration of sodium chloride (NaCl) in blood is 0.9 % (this is known as "physiological saline"). Imagine that a tired nurse accidently gave a patient an IV containing 5% saline, which entered the plasma ECF as illustrated below. Imagine that the cell is permeable to water, but is NOT permeable to NaCI. Use the drawing above to answer these questions: 18. Name the transport mechanism by which water moves across the cell membrane. 19. In which direction will the NET movement of water occur? A. Into the cell B. Out of the cell C. Water moves into and out of the cell at the same rate 20. Describe the tonicity of the ECF compared to the cytoplasm of the cell: in other words, the ECF is to the cytoplasm. Choose an option from this list: A. HYPOTONIO

Explanation / Answer

18- Water moves across the cell membrane through Simple diffusion. In this water moves from its higher concentration to lower concentration.

19- Therefore, the water will move from cell to the plasma. The option B is correct. The reason of behind this is plasma after getting 5% saline water will get more tonic than the cell that has only 0.9% saline water. Therefore, water will move from its higher to lower concentration.

20 -The ECF is hypertonic to the cytoplasm. The option C is correct

21- Over time, the cell will shrink due to the loss of water. The option B is correct.

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