Consider the following statements and choose the incorrect one:

Consider the following statements and choose the incorrect one:

A
One complete contraction and relaxation of heart is called a heartbeat.
B
The average heartbeat of an adult person while resting is 70 to 80 times per minute.
C
The number of heart beats increased too much during and after a physical exercise or when a person is excited.
D
A doctor listens to our heart beats with the help of an instrument called periscope.

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