Examlex
Which of the following populations is at the greatest risk for a vitamin B-12 deficiency?
Facilitated Diffusion
A process of passive transport, mediated by carrier proteins, allowing molecules to cross cell membranes along a concentration gradient.
Sodium-Potassium Exchange
A cellular process involving the active transport of sodium and potassium ions across the cell membrane, crucial for maintaining cellular and electrochemical functions.
Active Transport
The movement of substances across cell membranes against a concentration gradient, requiring energy.
Diffusion
The process by which molecules move from an area of higher concentration to an area of lower concentration.
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