The gradient used (e.g., high Na⁺ outside, low Na⁺ inside) is (like the Na⁺/K⁺ pump). This is why it's called "secondary"—it indirectly depends on ATP.
The gradient used (e.g., high Na⁺ outside, low Na⁺ inside) is (like the Na⁺/K⁺ pump). This is why it's called "secondary"—it indirectly depends on ATP.