It depdends: There are many causes of toe spasms/cramps and it is important to identify the source. Cramps and spasms can be due to dehydration and low potassium. But they can also be due to a nerve conditions as well. I recommend you see a specialist for further evaluation. ...Read more.
1 The SA node (called the pacemaker of the heart) sends out an electrical impulse. 2  The upper heart chambers (atria) contract. 3  The AV node sends an impulse into the ventricles.  The lower heart chambers (ventricles) contract or pump.
The Heartbeat. Your heart is a muscular organ that acts like a pump to continuously send blood throughout your body. Your heartbeat occurs when the atria and ventricles work together, alternately contracting and relaxing to pump blood through your heart.The electrical system of your heart is the power source that makes this possible.our heart is a muscular organ that acts like a pump to continuously send blood throughout your body. Your heartbeat occurs when the atria and ventricles work together, alternately contracting and relaxing to pump blood through your heart. The electrical system of your heart is the power source that makes this possible.