Data

Copy and paste the text below. It is read-only. Select All

aorta Largest artery in the body arteriole Small artery artery Largest type of blood vessel; carries blood away from the heart to all parts of the body. Notice that artery and away begin with an "a". artrioventricular bundle (bundle of His) Specialized muscle fibers connecting the atria with the ventricles and transmitting electrical impulses between them. His is pronounced "hiss." atrioventricular node (AV node) Specialized tissue in the wall between the atria. Electrical impulses pass from the pacemaker (SA node) through the AVnode and the atrioventtricular bundle or bundle of His toward the ventricles atrium (plural: atria) One of two upper chambers of the heart capillary Smallest blood vessel. Materials pass to and from the bloodstream through the thin capillary walls. carbon dioxide (C02) Gas (waste) released by body cells, transported via veins to the heart and then to the lungs for exhalation. coronary arteries Blood vessels that branch from the aorta and carry oxygen-rich blood to the heart muscle deoxygenated blood Blood that is oxygen-poor. diastole Relaxation phase of the heartbeat. electrocardiogram Record of the electricity flowing through the heart. The electricity is represented by waves or deflections called P, QRS, or T endocardium Inner lining of the heart endothelium Innermost lining of blood vessels. tricuspid valve Located between the right atrium and the right ventricle; it has three (tri-) leaflets, or cusps. valve Structure in veins or in the heart that temporarily closes an opening so that blood flows in only one direction vein Thin-walled vessel that carries blood from body tissues and lungs back to the heart. Veins contain valves to prevent backflow of blood vena cava (plura: venae cavae) Largest vein in the body. The superior and inferior vena cavae return blood to the right atrium of the heart. ventricle One of two lower chambers of the heart venule Small vein