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Animal Osmoregulation$
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Timothy J. Bradley

Print publication date: 2008

Print ISBN-13: 9780198569961

Published to Oxford Scholarship Online: April 2010

DOI: 10.1093/acprof:oso/9780198569961.001.0001

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Membranes as sites of energy transduction Membranes as sites of energy transduction

Membranes as sites of energy transduction Membranes as sites of energy transduction

Chapter:
(p.133) 9 Membranes as sites of energy transduction
Source:
Animal Osmoregulation
Author(s):

Timothy J. Bradley

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198569961.003.0009

Because membranes are impermeable to most solutes, gradients can be established and maintained between intra- and extracellular compartments. These gradients serve as forms of energy storage that can be used for thermodynamic work. Ion gradients also establish electrical gradients across membranes that serve as resistors and capacitors. Under these circumstances, the membranes are also sites of energy transduction where chemical gradients are transformed into electrical gradients. The energy stored across membranes can be used to transport solutes against their gradients, produce ATP, regulate pH, and produce action potentials. Examples are provided from mitochondrial function, intestinal nutrient uptake, and the uptake of dissolved organic matter in marine invertebrate larvae.

Keywords:   energy storage, energy transduction, membranes, mitochondria, intestine, marine larvae, nutrient uptake

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