ydän
Ydän is the Finnish term for the heart, the muscular organ that forms the core of the circulatory system. It pumps blood to the lungs and to the rest of the body, enabling oxygen delivery and nutrient transport.
The heart has four chambers: two atria and two ventricles. Valves ensure one-way blood flow between chambers
The heartbeat is driven by electrical impulses that start in the sinoatrial node, spread to the atrioventricular
The heart rate and force are regulated by the autonomic nervous system and hormones. Common conditions affecting