How does the professor develop the topic of ca
问题详情
How does the professor develop the topic of cardiac muscle？
A．By describing evolutionary changes in cardiac muscle
B．By classifying the types of muscle in the body
C．By explaining what happens if the heart stops beating
D．By comparing cardiac muscle and skeletal muscle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 compares cardiac muscle and skeletal muscle. The professor says ... skeletal muscle controls body movements, and cardiac muscle controls the body's blood flow. Skeletal muscle is fbund throughout the body, but cardiac muscle is found only in one place--the heart; Like skeletal muscle, cardiac muscle is striated; Cardiac muscle cells can generate impulses without any input from the nervous system. In contrast to this, skeletal muscles don't contract unless the nervous system tells" them to. (2.1)
