Septum - Thick muscular dividing wall in the heart preventing oxygenated and deoxygenated blood mixing., Cardiac muscle - Heart muscle tissue with intrinsic rhythm; does not fatigue., Myoglobin - Respiratory pigment with stronger oxygen affinity than haemoglobin., Right atrium - Upper right chamber receiving deoxygenated blood from the body., Right ventricle - Lower right chamber pumping deoxygenated blood to the lungs., Tricuspid valve (atrioventricular valve) - Valve between right atrium and ventricle preventing backflow., Tendinous cords (valve tendons, heartstrings) - Cord-like tendons preventing valves turning inside out under pressure., Pulmonary arteries - Carry deoxygenated blood from heart to lungs., Pulmonary veins - Carry oxygenated blood from lungs back to heart., Left atrium - Upper left chamber receiving oxygenated blood from lungs., Left ventricle - Chamber that pumps oxygenated blood around the body., Bicuspid valve (atrioventricular valve) - Valve between left atrium and ventricle preventing backflow., Aorta - Main artery leaving left ventricle carrying oxygenated blood under pressure., Systole - Contraction of the heart., Atrial systole - Contraction of the atria., Ventricular systole - Contraction of the ventricles., Diastole - Relaxation of the heart when chambers fill with blood., Cardiac cycle - Cycle of contraction (systole) and relaxation (diastole).,

Heart Structure

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