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Anatomy/Physiology
Unit 8 Vocabulary
Term | Definition |
---|---|
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 |