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Side ASide B
Largest artery in the body.
Largest type of blood vessel; carries blood away from the heart to all parts of the body.
Specialized muscle fibers connecting the atrium with the ventricles and transmitting electrical impulses between them.
atrioventricular bundle (bundle of His)
Specialized tissue at the base of the wall between the two upper heart chambers. Electrical impulses pass from the pacemaker through the AV node the bundle of His.
One of two upper chambers of the heart.
atrium (plural: atria)
Smallest blood vessel. Materials pass to and from the bloodstream through the thin capillary walls.
Gas (waste) released by body cells, transported via veins to the heart, and then to the lungs for exhalation.
carbon dioxide (CO2)
The blood vessels that branch from the aorta and carry oxygen-rich blood to the heart muscle.
Blood that is oxygen-poor.
Relaxation phase of the heartbeat.
Inner lining of the heart.
Innermost lining of blood vessels.
Valve between the left atrium and the left ventricle of the heart bicuspid valve.
Abnormal heart sound caused by improper closure of the heart valves.
Muscle layer of the heart.
Specialized nervous tissue in the right atrium that begins the heartbeat; also called the sinoatrial node.
Sac-like (double layered) membrane surrounding the heart.
Artery carrying oxygen-poor blood from the heart to the lungs.
Flow of blood from the heart to the lungs and back to the heart.
Positioned between the right ventricle and the pulmonary artery.
One of two pairs of vessels carrying oxygenated blood from the lungs to the left atrium of the heart.
Beat of the heart as felt through the walls of the arteries.
Partition; in the cardiovascular system, between the right and left sides of the heart.
septum (plural: septa)
Pacemaker of the heart.
Instrument to measure blood pressure.
Flow of blood from the body cells to the heart and back out from the heart to the cells.
Contraction phase of the heartbeat.
Thin-walled vessel that carries blood from body tissues and lungs back to the heart. It contains valves to prevent backflow of blood.
Largest vein in the body. The superior and inferior venae cavae return blood to the right atrium of the heart.
atrium, upper heart chamber