A racing heart is usually a sign of agitation or excitement. But if it's not unusual for your heart to beat too fast or to skip a beat, it might be worth having it checked out by a doctor.In order to ...

When the heart pumps or beats, it allows the blood to travel from out of the heart to the rest of the body, delivering oxygen and other essential components. A heartbeat signifies that the heart ...

Many people describe feeling like their heart is working too hard or beating irregularly. You feel heart palpitations for more than several seconds. You have a medical history of heart disease or risk ...

Hold out your hand and make a fist. If you're a kid, your heart is about the same size as your fist, and if you're an adult, it's about the same size as two fists. Your heart beats about 100,000 ...

Cardiac output close cardiac outputThe amount of blood pumped by the heart in one minute. Heart Rate x Stroke Volume = Cardiac Output. is the total volume of blood pumped out by the left ventricle ...

Sinus rhythm (a.k.a. normal sinus rhythm) refers to the normal heart beat originating from the sinoatrial node. This is manifested as an upright P wave in lead II of the ECG. Sinus bradycardia ...

Fans of "When Calls the Heart" have come to expect emotional depth and tightly woven story arcs with each season finale, and ...

is the number of times the heart beats in one minute. The average number of beats is 72 beats per minute. Stroke volume (SV) is the volume of blood pumped out of the heart with every beat.

Originally appeared on the NOVA Web site Cut ... beat more than 2.5 billion times. Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump ...