Chapter 11 Vocabulary Flashcards
Apex of the heart
Lower tip of the heart
Atrioventricular bundle
Specialized muscle fibers connecting the atria with the ventricles and transmitting electrical impulses between them
Aorta
Largest artery in the body
Artery
Largest type of blood vessel; carries blood away from the heart to all parts of the body
Atrium
One of two upper chambers of the heart
Arteriole
Small artery
Capillary
Smallest blood vessel. Materials pass to and from the bloodstream through the thin capillary walls
Carbon dioxide
Gas (waste) released by blood cells, transported via veins to the heart, and then to the lungs for exhalation
Coronary arterties
blood vessels that branch from the aorta and carry oxygen-rich blood to the heart muscle
Diastole
relaxation phase of the heartbeat
Endocardium
inner lining of the heart
Endothelium
innermost lining of blood vessels
Mitral Valve
valve between the left atrium and the left ventricle; bicuspid valve
Murmur
abnormal swishing sound caused by improper closure of the heart valves
Myocardium
Muscular, middle layer of the heart
Normal sinus rhythm
Heart rhythm originating in the sinoartrial node with a rate in patients at rest of 60 to 100 beats per minute
Pacemaker (sinoatrial node)
specialized nervous tissue in the right atrium that begins the heartbeat. An artificial cardiac pacemaker is an electronic apparatus implanted in the best to stimulate heart muscle that is weak and not functioning
Pericardium
Double-layered membrane surrounding the heart
Pulmonary artery
artery carrying oxygen-poor blood from the heart to the lungs
pulmonary circulation
flow of blood from the heart to the lungs and back to the heart
Pulmonary valve
valve positioned between the right ventricle and the pulmonary artery
Pulse
beat of the heart as felt through the walls of the arteries
Septum
Partition or wall dividing a cavity; such as between the right and left artia (interatrial septum) and right and left ventricles (interventricular septum)
Sinoatrial node (SA node)
pacemaker of the heart
Sphygmomanometer
Instrument to measure blood pressure
Systemic Circulation
Flow of blood from body tissue to the heart and then from the heart back to body tissues
Systole
contraction phase of the heartbeat
Tricuspid Valve
Located between the right atrium and the right ventricle; it has three 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 back flow of blood
Vena Cava
Largest vein in the body. The superior and inferior venae cavae return blood to the right atrium of the heart
ventricle
one of two lower chambers of the heart
venule
small vein
