試題詳解

71. Which one is the correct description of salt and water balance in animal?
(A) Sodium and potassium ions can easily diffuse through the lipid bilayer of plasma membranes.
(B) Sweat has a higher salt concentration than the blood does in humans.
(C) Animals that do not control internal water concentration also typically do not control the concentrations of ions like sodium and potassium.
(D) Transport of salts against their concentration gradients is energetically expensive.
(E) The filtrate that leaves the proximal convoluted tubule is much more concentrated than the blood in humans.