Most K⁺ Is Located in the Cells,with Little K⁺ in the Tissue

Multiple Choice

Most K⁺ is located in the cells,with little K⁺ in the tissue spaces.What accounts for the movement of additional K⁺ into the cells?

A) K+ in the tissue fluid diffuses into the cell.
B) K+ enters the cell in response to facilitated diffusion.
C) K+ is actively pumped into the cell.
D) K+ enters the cell because of pinocytosis.