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Proton pumps actively move H⁺ across membranes. Examples include: what molecules use active transport
Substances like urate or lactate often utilize specialized carrier proteins to cross membranes against resistance. Large Macromolecules (Bulk Transport) Have questions about a specific molecule or cell type
Active transport keeps your nerves firing, your heart beating, your thyroid working, and your cells from swelling or shrinking. Without it, gradients collapse, and life stops. Examples include: Substances like urate or lactate often
Like glucose, amino acids are often taken up by secondary active transport, co-transported with sodium ions. This happens in the intestine (after protein digestion) and in kidney tubules (to prevent loss in urine).
Complex carbohydrates used for energy or cell wall construction.
Most amino acids require active transport to enter cells, especially in the kidneys where they must be reabsorbed from urine.