ACTIVE transport of sodium across cell membranes is now established as one of the fundamental physiological processes of most vertebrate cells. This process probably requires some sort of carrier ...

The alternative to active transport is passive transport, which uses kinetic energy only to move the molecules. Passive transport can only move molecules from a region of higher concentration to lower ...

Jamila and Megan have had a Halloween party and, after eating so many sweets and chocolates, they feel like they cannot eat another bite. When discussing transport to get home, Alfred, the science app ...