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Is the blood in the pulmonary vein low or high in oxygen? (1 point) What is the definition of a vein? (1 point): Heart Blood Supply: (4 points)BIO 202 – Chapter 18
Page 4cardiac____________ veins drain blood from the heart muscle and carry it to the coronary sinus______________ which empties into the right atrium.What is a myocardial infarction? (1 point): Cardiac cycle: (13 points)The cardiac cycle consists of (1) the atria beating in unison (atrial systole________), (2) the contraction of both ventricles, (ventricular systole____________), and (3) the entire heart relaxes for a brief moment (diastolic___________).During the cardiac cycle, pressure within the heart chambers rises and falls with the opening ______ and closing ______________ of atria and ventricles.When the atria fill, pressure in the atria is greater_______________ than that of the ventricles, which forces the AV____________ valves open. Pressure inside atria rises further as they contract, forcing the remaining blood into the ventricles.When ventricles contract, pressure inside them rises___________________ sharply, causing AV_____ valves to close and the SL________________ and Pulmonary_____________ valves to open.As the ventricles contract, papillary_____ muscles contract, pulling on chordae tendineae_______ preventing the backflow of blood through the A-V valves.Heart sounds: (4 points)Heart sounds are described as a "lubb-dupp" sound.The first sound (lubb) occurs as ventricles___________ contract and AV_______ valves are closing.The second sound (dupp) occurs as ventricles__________ relax and aortic and Pulmonary____ valves are closing.Cardiac Conduction system (4 points)and