Multicellular animals use the nervous system for signal detection and transmission of information.
a) The neuron transmits nerve impulses. Identify the subcellular structure of the neuron that forms the basis for the transmission of nerve impulses. Describe how this structure is arranged under resting conditions before a signal is initiated.
b) Initiation of an impulse occurs at one end of a neuron. Explain changes in ion concentration and membrane potential that occur in response to signal initiation.