Which hormone is used in blood boosting by athletes?

The heart chamber that has the greatest workload is the right atrium, as it pumps blood out to the entire body

Indicate whether the statement is true or false

The normal inherent rate of the sinus node as a pacemaker is

A) 40—60 beats per minute. B) 20—40 beats per minute. C) 60—80 beats per minute. D) 60—100 beats per minute.