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Explain the role of chemical

Explain the role of chemical - Explain the role of chemical...

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Explain the role of chemical, electrical and electrochemical driving forces o Chemical - The key point is that molecules will move from high to low energy – that is, from high concentration to low concentration o Electrical – Electrical driving forces occur due to the membrane potential Outside more positive than negative o Electrochemical – The electrochemical driving force determines the direction in which the ions will move if they are allowed to cross the membrane spontaneously. When ions are being transported passively they always move in the direction of the electrochemical driving force. That is, when ions are transported passively they move down their electrochemical gradient. Note that the rate at which a substance is transported across a membrane refers to the number of molecules that cross the membrane in a given length of time – this is called flux. No energy is required.
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