Table 4.1 Crayfish Ion Concentrations (mM)
	[K+]	[Na+]	[Ca2+]	[Mg2+]	[Cl−]
Normal saline	5.4	207.3	10.0	2.6	235.6
High K+ saline	60.0	152.3	10.0	2.6	235.2
Low Na+ saline	5.4	2.3	10.0	2.6	235.6
Internal fluid*	265.0	17.4	0.4	10.0	12.7
*At an external [K+] of 5.4 mM; other external [K+]s may cause Na+ and Cl− to redistribute across the membrane (Wallin, 1967). Internal concentrations of Ca2+ and Mg2+ are from squid (Aidley, 1998).

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