| A | B |
|---|
| Pulmonary circuit: | to and from the lungs |
| Systemic circuit | to and from the rest of the body |
| Arteries | carry blood away from heart and carry it to the capillaries |
| Capillaries | microscopic vessels where exchange of nutrients, gases, and waste takes place between cells and blood |
| Veins | receive blood from capillaries and carry it back to the heart |
| Right atrium | receives systemic blood |
| Right ventricle | pumps blood to lungs (pulmonary) |
| Left atrium | receives blood from lungs |
| Left ventricle | pumps blood to organ systems (systemic) |
| pericardial cavity | cavity surrounding heart |
| Visceral pericardium (epicardium) | covers heart surface |
| Parietal pericardium | lines pericardial sac that surrounds heart |
| pericardial fluid | located between the visceral and parietal pericardium, reduces friction |
| Interatrial septum | separates atria |
| Interventricular septum | separates ventricles |
| Atrioventricular (AV) valves | located between atrium and ventricle, folds of fibrous tissue that ensure one-way flow from atrium to ventricle |
| Superior venae cava | large vein that carries systemic blood from the head, neck, upper limbs, and chest to the right atrium |
| Inferior venae cavae | large vein that carries systemic blood from the trunk, viscera, and lower limbs to right atrium |
| tricuspid valve | AV valve located between the right atrium and the right ventricle |
| pulmonary semilunar valve | valve located between the right ventricle and the pulmonary trunk |
| Pulmonary veins | carry blood to left atrium |
| bicuspid valve or mitral valve | AV valve separating the left atrium from the left ventricle |
| aortic semilunar valve | valve between the left ventricle and the aorta |
| Electrocardiogram ECG or EKG | is a recording of the electrical activity of the heart |
| Cardiac arrhythmias | abnormal patterns of cardiac activity |
| myocardial infarction | heart attack |
