A&P 2 University Of Memphis -A&P 2 - Heart questions with answers

A&P 2 University Of Memphis -A&P 2 - Heart questions with answers Describe the differences in the basic organization and principle function of the two primary circulatory routes: the pulmonary circulation and the systemic circulation - correct answer - Pulmonary circulation - carries blood from heart through lungs back to heart. Allows for exchange of gases w/in lungs where CO2 is exchanged for O2 - Systemic circulation - carries oxygenated blood from heart to tissues and organs of body and returns O2-poor/CO2-filled blood back to heart Describe the coronary circulation route - correct answer Blood leaving the left side of the heart flows directly from the aorta into the coronary arteries and then returns to the right side of the heart via the cardiac veins. Identify the layers of the pericardium and describe the function of the pericardial fluid - correct answer - Parietal pericardium - outer layer away from heart -- divided into fibrous and serous layer - Visceral pericardium - inner layer on surface of heart - Pericardial cavity - space b/t parietal pericardium and visceral pericardium - Pericardial fluid - provides lubrication between the two surfaces and allows the heart to move smoothly as it beats Identify and describe the three layers of the heart wall - correct answer - Epicardium - internal surface (synonymous w/ visceral pericardium) containing blood vessels of the heart and adipose tissue -Myocardium - Thickest layer composed of cardiac muscle tissue allowing heart to contract in unison - Endocardium - layer of simple squamous epithelium that lines inner walls of heart and covers valves Explain the principle function of the heart valves - correct answer allow the blood to flow in only one direction Explain the fluid dynamics and pressure changes that causes the bicuspid valve to open and close during the cardiac cycle - correct answer - Open - during ventricular relaxation, when the pressure in the LA exceeds the pressure in the LV - Close - during contraction of the ventricle, once the pressure in the LV exceeds that in the LA