“concentration gradient”造句，怎麼用concentration gradient造句

Active transport The use of energy to move a solute across a membrane against a concentration gradient, a potential gradient, or both (electrochemical potential) . Uphill transport.

Substrates may accumulate intracellularly against a concentration gradient.

Decreased blood flow( eg, in shock) may lower the concentration gradient across the intestinal mucosa and decrease absorption by passive diffusion.