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The heart serves as the pump of the circulatory system, transporting blood throughout the body to deliver oxygen, nutrients, and hormones while removing waste products.
The average human heart weighs about 250 grams in females and 350 grams in males, roughly the size of a closed fist.
The heart beats approximately 100,000 times per day, functioning continuously throughout a person's life.
The circulatory system transports water, gases (such as O2, CO2, N2), proteins, and hormones, while also regulating temperature and blood pH.
The heart consists of three tissue layers: the epicardium (outer layer), myocardium (muscle layer), and endocardium (inner layer).
The heart has four chambers: the right atrium, right ventricle, left atrium, and left ventricle, each playing a crucial role in blood circulation.
Heart valves ensure unidirectional blood flow through the heart, preventing backflow and maintaining efficient circulation.
The SA node, or sinoatrial node, is the heart's natural pacemaker, initiating electrical impulses that trigger heartbeats and regulate heart rhythm.
An ECG (electrocardiogram) measures the electrical changes on the surface of the body resulting from the depolarization and repolarization of the myocardium.
The P wave represents atrial depolarization, indicating the electrical signal spreading from the SA node to the contractile fibers of both atria.
The QRS complex represents rapid ventricular depolarization as the action potential spreads through the ventricular contractile fibers, while atrial repolarization occurs.
The T wave indicates ventricular repolarization, signifying that the ventricles are beginning to relax after contraction.
The P-Q interval measures the conduction time from atrial excitation to the beginning of ventricular excitation, reflecting the time for the atrial kick to fill the ventricles.
Blood pressure is the force exerted by circulating blood on the walls of blood vessels, typically measured in larger arteries like the brachial artery, reflecting the heart's pumping efficiency.
The cardiac cycle refers to the sequence of events in one heartbeat, including atrial and ventricular systole (contraction) and diastole (relaxation), which facilitates blood flow through the heart.
Actin and myosin filaments interact during the contraction cycle, sliding past one another to develop tension and facilitate the contraction of cardiac muscle fibers.
The S-T segment represents the period when the ventricular contractile fibers are depolarized, indicating the time it takes to empty the ventricles.
ECG recordings can help determine normal from abnormal cardiac activity by measuring the presence, size, and time intervals of waveforms in the cardiac cycle.
Atrial systole refers to the contraction of the atria, pushing blood into the ventricles, while ventricular systole refers to the contraction of the ventricles, pumping blood out of the heart.
The cardiac conduction system coordinates the heart's rhythm and ensures that the heart beats in a synchronized manner, allowing for efficient blood flow.
Heart rate can be influenced by various factors including physical activity, emotional state, hormonal levels, and overall health status.