Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamines - epinephrine and norepinephrine) to accelerate the heart rate.
The answer is b. This is the answer because sometimes the hands free devices can be more dangerous than phones
The answer is A (1) Prokaryotes
Between the 6th and 21st days of the menstrual cycle