Transmission of nerve impulses. Nerve cells transmit...

Transmission of nerve impulses. Nerve cells transmit electric signals through their long tubular axons. These signals propagate due to a sudden rush of $\mathrm{Na}^{+}$ ions, each with charge $+e,$ into the axon. Measurements have revealed that typically about $5.6 \times 10^{11} \mathrm{Na}^{+}$ ions enter each meter of the axon during a time of 10 $\mathrm{ms}$ . What is the current during this inflow of charge in a meter of axon?

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Key Concepts

Electric Current

Electric current is defined as the amount of electric charge passing a point or surface per unit time, typically measured in amperes (A). It represents the rate of charge flow, where one ampere equals one coulomb per second, essential for understanding how ionic movement translates to measurable electrical signals.

Elementary Charge

The elementary charge is the fundamental unit of electric charge, carried by a single proton or the magnitude of the charge on a single electron, approximately 1.602 × 10?¹? coulombs. This concept is crucial for converting a count of ions into a total amount of charge, which is then used to calculate current.

Ion Transport in Neurons

Ion transport in neurons involves the movement of ions like sodium (Na?) across the neuronal membrane, which is a critical process for generating electrical signals, such as action potentials. The influx of these charged ions through channels in the axon membrane establishes the current necessary for nerve signal propagation.

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