There is a short pause to allow blood to return to the heart and fill before the electrical cycle repeats itself for the next heartbeat.Ventricular contraction pumps blood to the body (from the left ventricle) and the lungs (from the right ventricle). The electrical signal then travels through the ventricles, stimulating those heart muscle cells to contract.The electrical signal that was generated in the SA node travels to a junction box between the atria and ventricles (the AV node) where it is delayed for a few milliseconds to allow the ventricles to fill.Contraction of the atria pushes blood into the ventricles. Normally, the impulse generated by the SA node runs through the heart's electrical grid and signals the muscle cells in the atria to beat simultaneously, allowing for a coordinated squeeze of the heart.
The SA node acts independently of the brain to generate electricity for the heart to beat. The heart has its own automatic pacemaker called the sinaoatrial, or SA node, located in the right atrium. The right ventricle then pumps blood through the pulmonary artery to the lungs where carbon dioxide is stripped off, oxygen is replaced, and the cycle begins again.The blood enters the right atrium though the vena cava, where it is collected and pumped to the right ventricle. Blood that returns to the heart is depleted of oxygen and carries carbon dioxide, the waste product of metabolism.This blood supplies organs and cells with oxygen and nutrients necessary for metabolism. Blood then flows into the left ventricle where it is pumped into the aorta and is distributed to the rest of the body.Oxygen-rich blood from the lungs enters the left atrium through the pulmonary veins.The right side of the heart collects blood from the body and pumps it to the lungs while the left side of the heart receives blood from the lungs and pumps it to the body.īlood flows through the body in the following way: The heart has four chambers - the right and left atrium and the right and left ventricle. What Does the Heart Look Like and How Does It Work? This kind of monitoring does not constitute a complete ECG.A heart monitor only measures the rate and rhythm of the heartbeat.By comparison, a heart monitor requires only three electrode leads – one each on the right arm, left arm, and left chest.The printed view of these recordings is the electrocardiogram.The signals received from each electrode are recorded.An electrode lead, or patch, is placed on each arm and leg and six are placed across the chest wall.Ten electrodes are needed to produce 12 electrical views of the heart.A standardized system has been developed for the electrode placement for a routine ECG.The electrocardiogram can measure the rate and rhythm of the heartbeat, as well as provide indirect evidence of blood flow to the heart muscle.The heart is a two stage electrical pump and the heart's electrical activity can be measured by electrodes placed on the skin.
Numerous textbooks are devoted to the subject. While it is a relatively simple test to perform, the interpretation of the ECG tracing requires significant amounts of training. The electrocardiogram (ECG or EKG) is a diagnostic tool that is routinely used to assess the electrical and muscular functions of the heart. Picture of the basic anatomy of the heart
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