In secondary active transport (co-transport), what is the source of energy driving the uphill movement of one substance?
Answer
An existing electrochemical gradient established by primary active transport.
Secondary active transport indirectly uses energy by coupling the movement of a substance down its steep electrochemical gradient (like $ ext{Na}^+$ returning inward) with the movement of another substance up its gradient.
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In Da Club - Membranes & Transport: Crash Course Biology #5
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