Chapter 19 Flashcards
Arteries
Carry blood AWAY from the heart; Mostly oxygenated blood
Veins
Carry blood to the heart; mostly deoxygenated blood
Atria
Gathering place for blood to be sent to ventricles
Ventricles
inferior chambers that heart muscles actively pump blood away; have thicker walls than atria; left ventricle has thicker wall than right ventricle
Pulmonary Trunk
Transports blood from right ventricle and splits into pulmonary arteries
Aorta
Transports blood from left ventricle
Superior and inferior vena cava
Drain deoxygenated blood into right atrium
Pulmonary Veins
Drain oxygenated blood into left atrium
Atrioventricular Valves
Left and Right AV valves; sit between atrium and ventricle on both sides; right is tricuspid; left is bicuspid/mitral)
Semilunar Valves
Sit between ventricle and arterial trunk; Pulmonary and Aortic Valves
Basic Pattern
Right heart to lungs to left heart to systemic tissues to right heart
Pericardium
Encloses the heart; 3 layers (fibrous pericardium and parietal and visceral layers of serous pericardium)
Apex
inferior, conical end of the heart
Base
postero-superior surface of heart
Fibrous Pericardium
Outermost covering of the heart; dense irregular CT; attaches to diaphragm and base of aorta; anchors heart and prevents overfilling
Parietal Layer of Serous Pericardium
Simple Squamous epithelium and areolar CT;
Visceral Layer of Serous Pericardium
Simple squamous epithelium an areolar CT; attaches directly to the heart
Epicardium
Visceral Layer of Serous Pericardium; simple squamous epithelium and areolar CT
Myocardium
middle layer of heart wall; cardiac muscle tissue that contracts to pump blood
Endocardium
covers internal surface of heart and external surface of valves; simple squamous epithelium and areolar connective tissue; continuous with lining of blood vessels
Interatrial Septum
Separates atria
Interventricular Septum
separates ventricles
Fibrous Skeleton
dense irregular CT; provides structural support at boundary of atria and ventricles; forms fibrous rings to anchor valves
Sinoatrial Node
initiates heartbeat; the heart doesn’t require neural input to beat
Atrioventricular Node
floor of right atrium
Purkinje fibers
extend from left and right bundles at heart’s apex; course through walls of ventricles; provide the heart’s conduction system to perform synchronized contractions of its ventricles
ANS influence on heart rate
Medulla oblongata; sends signals via sympathetic and parasympathetic pathways; modifies cardiac activity
Valve Function
ensure one-way flow of blood through heart
Auricles
wrinkled extension of atrium
coronary sulcus
separates atria from ventricles