The heart's external and internal structures are a symphony of precision.
In short: From the apex to the coronary sulcus, the heart’s chambers and valves orchestrate life-sustaining circulation. Deoxygenated blood enters the right atrium, while oxygenated blood arrives at the left. Swipe to explore its intricate anatomy and how it keeps you alive.
The heart is a muscular organ with four chambers: two atria and two ventricles. The right atrium receives deoxygenated blood from the body via the superior and inferior vena cava, while the left atrium receives oxygenated blood from the lungs through the pulmonary veins. The atria pump blood into the ventricles through the tricuspid and bicuspid valves, respectively. The right ventricle sends blood to the lungs via the pulmonary artery, and the left ventricle pumps oxygenated blood to the body through the aorta. This dual circulation system ensures that oxygen and nutrients reach all parts of the body while waste is removed.
Externally, the heart has several key features. The apex is the pointed end of the heart, while the base is the broader, more rounded part. The pulmonary surface faces the lungs, the sternocostal surface is against the sternum and ribs, and the diaphragmatic surface is near the diaphragm. The right border is the most prominent, and the coronary sulcus separates the atria from the ventricles. Internally, the septum divides the heart into left and right sides. The interventricular septum has a muscular and membranous part, while the interatrial septum contains the oval fossa, a remnant of the foramen ovale from fetal life.
The heart's internal structures include the right and left atria, which have pectinate muscles for contraction. The right atrioventricular opening is guarded by the tricuspid valve, and the left atrioventricular opening is guarded by the bicuspid (mitral) valve. The aortic valve, a semilunar valve, controls blood flow from the left ventricle to the aorta. These valves ensure unidirectional blood flow and prevent backflow.
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Sources
- Summary by Intellect · source: Anatomy of the Heart - External & Internal Structures
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