cause the arteries to expand. decrease the heart rate. increase the heart rate. send fewer signals.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: In the heart there is a group of specialized cells that regulates the frequency of the heartbeat. During strenuous exercise, the group of cells will most likely
Possibilities:
- cause the arteries to expand.
- decrease the heart rate.
- increase the heart rate.
- send fewer signals.

increase the heart rate.