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Anatomy/Physiology

Unit 8 Vocabulary

TermDefinition
Intrinsic Regulation Within the heart; Force of contraction related to the amount of stretch.
Extrinsic Regulation Hormonal or nervous stimulation; Fight or Flight Response.
Cardiac Output Amount of blood pumped per minute.
Epicardium Serous membrane forming outer surface of heart; simple squamous.
Myocardium Thick middle layer; cardiac muscle cells and produces contraction of heart.
Endocardium Inner surface of heart chambers; composes valves.
Superior Vena Cava Large vein carrying blood from the upper body to the right atrium.
Inferior Vena Cava Large vein carrying blood from the lower body to the right atrium.
Pericardial Cavity Space surrounding heart, located between visceral and parietal pericardium.
Pericardial Fluid Located in pericardial cavity, and produced by serous pericardium; reduces friction when heart moves.
Coronary Sulcus Separates atria from ventricles; extending around the heart.
Pulmonary Veins Blood vessels that carry blood from the lungs back to the left atrium.
Pulmonary Arteries Blood vessels carrying blood from the pulmonary trunk, extending from the right ventricle, to the lungs.
Systemic Circulation Part of the cardiovascular system which carries oxygenated blood away from the heart to the body, and returns deoxygenated blood back to the heart.
Intercalated Disks Cross-bands that separate the opposing ends of cardiac muscle cells.
Innervations of Heart The heart is innervated by parasympathetic and sympathetic fibers.
(SA) Sinoatrial Node Located near the opening of the SVC. It is the pacemaker of the heart.
Refractory Period The rest period of the heart, when ventricles are in diastole.
Purkinje Fibers Autorhythmic cells that wind their way through the ventricles.
Waves of Electrocardiogram P Wave, QRS, T Wave
Systolic Contraction
Diastolic Relaxation or Filling
Created by: BrittD2015
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