Starling's Law of the Heart ____________.explains why heart-rate increases with an increase in sympathetic activity in the heart b.

Starling's Law of the Heart ____________. 

1. a.explains why heart-rate increases with an increase in sympathetic activity in the heart
2. b.describes how stroke volume is regulated in part by preload and end diastolic volume
3. c.is the law that dictates how the electrical signal in the heart is transmitted
4. d.is related to how breathing rate is affected by heart rate
5. e.describes the control of venous return