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Chapter 4: Q9E (page 842)

BIO Transmission of Nerve Impulses. Nerve cells transmit electric

signals through their long tubular axons. These signals propagate due to a

sudden rush of Na+ions, each with charge +e, into the axon. Measurements

have revealed that typically about 5.6×1011Na+ions enter each meter of the

axon during a time of . What is the current during this inflow of charge

in a meter of axon?

Short Answer

Expert verified

The current during the inflow of charge in a meter of axon is9μA.

Step by step solution

01

Define the current.

The charge per unit time is known as the current .

I=Qt

Here, I is current in ampereA, Q is charge in Columbus Cand t is time in sec

02

Determine current and direction of current.

Determine the current between the two electrodes as:

I=NQt=NumberofNa+×qt

Substitute the values and solve as,

I=5×1011×-1.6××10-1910×10-3=8.96μA≈9μA

Hence, current during the inflow of charge in a meter of axon is 8.96 μA.

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Most popular questions from this chapter

(a) At room temperature, what is the strength of the electric field in a

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(See Discussion Question Q25.14.) An ideal ammeter A is placed in a circuit with a battery and a light bulb as shown in Fig. Q25.15a, and the ammeter reading is noted. The circuit is then reconnected as in Fig. Q25.15b, so that the positions of the ammeter and light bulb are reversed. (a) How does the ammeter reading in the situation shown in Fig. Q25.15a compare to the reading in the situation shown in Fig. Q25.15b? Explain your reasoning. (b) In which situation does the light bulb glow more brightly? Explain your reasoning.
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