hjertehulerne

Hjertehulerne refers to the chambers of the heart. The human heart has four chambers: two atria and two ventricles. The atria are the upper two chambers, which receive blood. The right atrium receives deoxygenated blood from the body, and the left atrium receives oxygenated blood from the lungs. The ventricles are the lower two chambers, which pump blood out. The right ventricle pumps deoxygenated blood to the lungs, and the left ventricle pumps oxygenated blood to the rest of the body.

The atria are separated by the interatrial septum, and the ventricles are separated by the interventricular septum. The valves of the heart, including the tricuspid valve, pulmonary valve, mitral valve, and aortic valve, ensure that blood flows in only one direction through these chambers.

In other vertebrates, the number and structure of heart chambers can vary. Fish have a two-chambered heart, amphibians and most reptiles have a three-chambered heart, and birds and crocodiles have a four-chambered heart, similar to mammals. The concept of hjertehulerne is fundamental to understanding cardiac function and blood circulation.