Ch. 15 Flashcards
A loose fitting membrane that encloses the heart, consisting of a superficial fibrous layer and a deep serous layer
Pericardium
Pertaining to or forming the outer wall of a body cavity
Parietal layer
Thin film of liquid that reduces friction between the membranes as the heart moves
Pericardial fluid
The thin outer layer of the heart wall, composed of serous tissue and mesothelium
Epicardium
The middle layer of the heart wall, made up of cardiac cardiac, lying between the epicardium and the endocardium and constituting the bulk of the heart
Myocardium
The layer of the heart wall, composed of endothelium and smooth muscle, that lines the inside of the heart and covers the valves and tendons that hold the valves open
Endocardium
An irregular transverse thickening of sarcolemma that contains desmosomes, which hold cardiac muscle fibers together, and gap junctions, which aid in conduction of muscle action potentials from one fiber to the next
Intercalated disc
Two upper chambers of the house
Atria
Two lower chambers of the heart
Ventricle
Prevent blood from flowing backwards
Valves
A recording of the electrical charges that accompany the cardiac cycle that can be detected at the surface of the body; may be resting, stress, or ambulatory
Electrocardiogram
In the cardiac cycle, the phase of contraction of the heart muscle, especially of the ventricles
Systole
In the cardiac cycle, the phase of relaxation or dilation of the heart muscle, especially of the ventricles
Diastole
An abnormal sound that consists of a flow noise that is heard before, between, or after the normal heart sounds, or that may mask normal heart sounds
Heart murmur
The volume of blood pumped from one ventricle of the heart (usually measured from the left ventricle) in 1 minute; normally about 5.2 liters/min in an adult at rest
Cardiac output
