1 You inject a squid axon with a small volume of 0.1 M NaCl and 0.1 M KCl, both containing radioactive sodium and potassium ions:

1(a) You have equipment to detect radiation in the external solution. Which of the radioactive ions do you detect in the external solution when the neuron at rest?

1(b) And after stimulating the neuron to generate several action potentials, which of the ions do you detect in the external solution?