You are asked to evaluate an idea for making it possible for a stroke patient to

Question

You are asked to evaluate an idea for making it possible for a stroke patient to contract the biceps muscle in order to lift the forearm. The muscle will contract if a current of about 20 mA flows through the upper arm. Assume that the long of the forearm is 0.40 m, its radius for the cross-section is 8.0 cm and the tissue resistivity is 5.0 ??m.

Part A

Determine the potential difference across electrodes, one inserted near the top of the arm and the other near the elbow, that will produce this current.

Express your answer to two significant figures and include the appropriate units.

?V=

Explanation / Answer

?V= I R

R = RESISTIVITY * LENGTH / AREA = 99.47 OHM

?V= I R = 20 mA * 99.47 OHM =1.989 V

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