What process best characterizes Ca2+ movement from the cytosol (low Ca2+ concentration) into the endoplasmic reticulum (high Ca2+ concentration)?
A. Calcium movement occurs by passive diffusion.
B. Calcium movement is spontaneous.
C. Calcium movement occurs by facilitated diffusion using a transporter protein.
D. Calcium movement involves active transport.
E. Calcium movement does not require energy.
Answer: D
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