A-A+
What happens when an electrical impulse genera
问题详情
What happens when an electrical impulse generated in one part of the heart spreads to all the cardiac muscle cells？
A．The impulse spreads to the bones.
B．The cardiac muscles extend.
C．The heart beats faster.
D．The whole heart contracts.请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：D
解析：The professor says ...an electrical impulse generated in one part of the heart will spread to all the cardiac muscle cells. Thus, the whole heart will contract. (2.2)
