Chapter 16 Flashcards
(29 cards)
Aortic valve
Semilunar valve located between the left ventricle and aorta
Atrioventricular valve
Cuspid valves located between the atria and ventricles; include the tricuspid and bicuspid (mitral) valves
Atrial conducting fibers
The specialized conducting fibers that transmit the cardiac impulse (action potential) from the SA node in the right atrium to the left atrium
Atrium
Upper chamber of the heart that receives blood from veins
Automaticity
The ability of the cardiac cells to generate its own electrical signals independently of stimulation from the CNS
AV node
A part of the cardiac conduction system that acts as a relay station for the electrical signal coming from the SA node in the right atrium into the ventricles; the AV node slows the signal
Bicuspid valve
The atrioventricular valve between the left atrium and left ventricle; also called the mitral valve
Cardiology
Study of the heart
Chordae tendineae
Tough fibrous bands of connective tissue that attach the cusps of the AV valves to the walls of the ventricles of the heart
Conduction system
Specialized tissue in the heart that generates and transmits the electrical signals ( cardiac impulses or action potential)
Coronary arteries
Right and left coronary arteries deliver oxygenated blood to the heart muscle
Electrocardiogram (ECG)
Graphic recording of the electric events that occur during the cardiac cycle
Endocardium
Inner lining of the heart wall
Epicardium
Outer layer of the heart; forms part of the pericardium
Great vessels
The large blood vessels that bring blood to and away from the heart: aorta, superior and inferior venae cavae, pulmonary trunk, and pulmonary veins
Heart
The hollow muscular pump that pumps blood to the lungs for oxygenation and then to the rest of the body for the distribution of oxygen, nutrients, and hormones; the heart also picks up and delivers waste to the organs of excretion
His- Purkinje system
A path of specialized conducting cells within the ventricles of the heart; allows the electrical signals to spread throughout the ventricles rapidly, thereby initiating myocardial contraction (systole)
Interatrial septum
The septum between the right and left atria of the heart
Mitral valve
Bicuspid valve
Myocardium
Heart muscle
Pacemaker
Specialized conduction tissue located in the upper right atrium; its rate of depolarization determines heart rate
Pericardium
Slinglike serous membrane that partially encloses the heart; supports the weight of the heart
Precordium
Area of the anterior chest that overlies the heart
Purkinje fibers
Fast- conducting fibers located in the ventricular walls; conduct the electrical impulses from the bundle of His to the ventricular myocardium
