When heart rate increases what else increases?

Your heart  increase its stroke volume by pumping more forcefully or increasing the amount of blood that fills the left ventricle before it pumps. Generally speaking, your heart beats both faster and stronger to increase cardiac output during exercise.

Hope this helps ; ) , thanks, rating are all appreciated.

Miss Hawaii

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .