Question

what process concentrates calcium within the cell?
facilitated diffusion
active transport
osmosis

Explanation:

• Facilitated diffusion is a passive transport process that moves substances down their concentration gradient with the help of transport proteins. It does not concentrate substances against a gradient.
• Osmosis is the movement of water across a semi - permeable membrane from an area of lower solute concentration to an area of higher solute concentration. It is not related to the concentration of calcium ions.
• Active transport uses energy (usually ATP) to move substances against their concentration gradient. Calcium ions are often concentrated within cells (e.g., in muscle cells for muscle contraction) against their concentration gradient, and this is achieved through active transport mechanisms such as calcium pumps.

Answer:

active transport