Biol 227 Exam 5 Questions and Answers 100% Pass

Biol 227 Exam 5 Questions and Answers 100% Pass Pulmonary circuit - - Right side of heart; carries blood to the lungs for gas exchange and returns it to the heart - leaves through pulmonary trunk, artery - comes through pulmonary veins - goes into left atrium Systemic circuit - - left side of heart; supplies oxygenated blood to all tissues of the body and returns it to the heart - more blood vessels - Enter Right atrium - inferior and superior Vena cava 2 100% Pass Guarantee Katelyn Whitman, All Rights Left side of heart - -Fully oxygenated blood arrives from lungs via pulmonary veins -Blood sent to all organs of the body via aorta Right side of heart - -Oxygen-poor blood arrives from inferior and superior venae cavae -Blood sent to lungs via pulmonary trunk (arteries) Base of heart - Wide, superior portion of heart, large vessels attack here apex of the heart - Tapered inferior end, tilts to the left Pericardium - -Double-layered membrane surrounding the heart. - allows heart to beat without friction, provides room to expand, yet resists excessive expansion - anchored to diaphragm inferiorly and sternum anteriorly - same as epicardium and visceral pericardium - most deep Parietal pericardium - - Pericardial sac 3 100% Pass Guarantee Katelyn Whitman, All Rights - superficial fibrous layer of connective tissue - deep, thin serous layer Visceral pericardium (epicardium) - - serous membrane that directly covers the heart - adipose in thick layer in some places - coronary blood vessels travel through this layer Pericardial cavity - Space inside the pericardial sac filled with 5 to 30 ml ot pericardial fluid Pericarditis - inflammation of the pericardium Levels of the pericardium (superficial to deep) - - Pericardial sac - fibrous layer - serous layer - pericardial cavity - epicardium Myocardium - - Layer of cardiac muscle proportional to work load 4 100% Pass Guarantee Katelyn Whitman, All Rights -muscle spirals around heart which produces wringing motion *does all the work *contract and put pressure on blood flow *high to low pressure Endocardium - - Smooth inner lining of heart and blood vessels * slick internal lining allows for blood to flow easy - covers the valves surfaces and is continuous with endothelium of blood vessels * simple squamos epithelium * expose to external environment through blood * like epithelium Fibrous skeleton of the heart - - Framework of collagenous and elastic fibers *prevents heart from over-expanding 5 100% Pass Guarantee Katelyn Whitman, All Rights - provides structural support and attachment for cardiac muscle and anchor for value tissue - electrical insulation between atria and ventricles; important in timing and coordination of contractile activity * isolates electrical signals Levels of the heart wall (superficial to deep) - Epicardium, myocardium, endocardium Right and left atria - - Two superior chamber