primary and secondary transport role in the body

primary and secondary transport. Primary active transport means that by chemiosmotic coupling between an exergonic chemical reaction (such as hydrolysis of ATP) and transport the free energy generated by the chemical reaction is used for concentrative transport (such as Na/K-ATPase or H-ATPase). In secondary transport the energy stored in those concentration gradients is used in osmoosmotic coupling (co- or countertransport) for concentrative transport of other solutes. To discriminate between the these two types of energization is not easy as the historical development of the concept of secondary active transport, especially of the Na-solute cotransport systems, illustrates

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