In 1850 German physiologist Hermann von Helmholtz attached wires to a frog's leg muscle so that when the muscle contracted it broke a circuit.
在1850年,德国生理学家Hermann von Helmholtz把电线连在一只青蛙的腿肌上,这样肌肉收缩时就断掉了电路。
In 1850 German physiologist Hermann von Helmholtz attached wires to a frog's leg muscle so that when the muscle contracted it broke a circuit.
在1850年,德国生理学家Hermann von Helmholtz把电线连在一只青蛙的腿肌上,这样肌肉收缩时就断掉了电路。
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