A great workout can make you feel great physically and mentally, in part because of what “feel good” hormones that get released by your nervous system?

Ever started hurting a day or two after a workout? Blame DOMS, which stands for delayed onset ______ soreness.

Which animal has more than one heart?

Heart disease is the number 1 cause of death in the United States.

What is the ability of the heart, lungs, and blood vessels to deliver oxygen to your body tissues without becoming overly tired?

The _________ pumps blood throughout the entire body.

An irregular, rapid heart rate that may cause symptoms like heart palpitations, fatigue, and shortness of breath.

How many chambers does the heart have ?

The number of times the heart Ventricles beat in one minute is known as?