Mammalian blood contains the equivalent of 0.15M NaCl. Seawater contains the equivalent of 0.45 M NaCl. What will happen if red blood cells are transferred to seawater? The blood cells will take up water, swell, and eventually burst. Water will leave the cells, causing them to shrivel and collapse. NaCl will be exported from the red blood cells by facilitated diffusion. NaCl will passively diffuse into the red blood cells.

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