How Would Amino Acids and Calcium Ions from the Bloodstream

Question

How would amino acids and calcium ions from the bloodstream move across a cell membrane?
A) diffusion
B) osmosis
C) facilitated diffusion
D) active transport

Accepted Answer

Facilitated diffusion is used for amino acids as they are large and polar, requiring a protein channel to move across the cell membrane. Calcium ions also use facilitated diffusion through ion channels.