Copy the vocab definitions into the Vocab section of your science notebook

§   Pulse – A measure of the speed at which a heart beats. When the heart contracts (squeezes), it forces blood through the arteries and they stretch in a rhythm.

§    Regulate – The process of keeping chemicals and conditions in the body balanced. Ex: Your heart rate changes to keep the oxygen levels in your blood within the range needed for survival.

* Recovery Time -  The time it takes for your pulse to return to within 20% of your resting pulse