Human Heart Anatomy And Conduction System — a labelled NEET Biology diagram with a definitions lexicon.
Human Heart Anatomy and Conduction System Labelled parts: Superior vena cava, Inferior vena cava, Right atrium, Tricuspid valve, Right ventricle, Right bundle branch, SA node (pacemaker), AV node, Left atrium, Pulmonary veins, Bicuspid (mitral) valve, Left ventricle, Semilunar valves, Pulmonary artery, Aorta, Purkinje fibers, Bundle of His, Left bundle branch, ECG, P wave, QRS complex, T wave. This large vein collects deoxygenated blood from the upper body (head, neck, arms) and returns it to the right atrium of the heart. It is one of the two major systemic veins. FYI: Blood entering the superior vena cava is deoxygenated and has a lower partial pressure of oxygen compared to arterial blood. This large vein collects deoxygenated blood from the lower body (abdomen, pelvis, legs) and returns it to the right atrium of the heart. It is the largest vein in the body. FYI: The inferior vena cava is formed by the confluence of the iliac veins and drains blood from the systemic circulation below the diaphragm. This valve is located between the left atrium and the left ventricle. It prevents the backflow of blood into the left atrium when the left ventricle contracts. FYI: The mitral valve is the largest valve in the heart and is crucial for maintaining unidirectional blood flow. These valves (aortic and pulmonary) are located at the exit points of the ventricles into the major arteries. They prevent the backflow of blood into the ventricles after ejection. FYI: The semilunar valves open when ventricular pressure exceeds arterial pressure, allowing blood to be pumped out of the heart. The Sinoatrial node is the natural pacemaker of the heart, located in the right atrium. It initiates the electrical impulse that causes atrial contraction. FYI: The SA node fires spontaneously at a rate of 60-100 beats per minute (bpm) under normal conditions. This specialized bundle of cardiac muscle conducts the electrical impulse from the AV node down through the septum. It is the only electrical connection between the atria and the ventricles. FYI: The Bundle of His ensures that ventricular contraction occurs simultaneously, maximizing cardiac efficiency. This branch carries the electrical impulse from the Bundle of His into the left ventricle. It rapidly distributes the impulse to the muscle fibers of the left ventricle. FYI: Damage to the left bundle branch can lead to a specific type of heart block (Bundle Branch Block), affecting ventricular rhythm.