Pregnancy, menopause, and thyroid issues can all create a lot of changes in the body because your hormones are out of whack. Possibly your heart skips a beat here and there as an increase in blood ...

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 ...

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 ...

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 ...

A person’s heart rate, or pulse rate, refers to how many times the heart beats within a minute ... first thing in the morning before getting out of bed. An elevated heart rate is typically ...

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 ...

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 ...