試題詳解

8. An electrocardiogram (ECG) can detect heart activity because the heart can form an electric dipole under external stimulation. Suppose the capacitance per unit area of a cardiac myocyte (心肌細胞) is C, the total surface area of the cardiac myocyte is A, and the transmembrane voltage is V. Suppose that the thickness of the cardiac myocyte is d. What is the electric dipole moment of a single cardiac myocyte?
(A) CVAd
(B) CVd
(C) CVd/A
(D) CV/A
(E) CV