If Milo gets excited and his heart starts pumping more blood with each stroke, what happens to his heart rate?
increases decreases
A B
When the heart expels more blood with each stroke, the heart has to beat less often in order to maintain the same volume of blood flow.
beat less often
more
less often
MORE
LESS
heart expels more blood with each stroke
increases
decreases
heart rate
heart rate
heart rate