In children with tetralogy of Fallot, why does unoxygenated blood enter the systemic circulation causing cyanosis? A The aorta and pulmonary artery have exchanged positions B Pulmonary valve stenosis changes the ventricular pressure C The septal defect allows exchange of blood between the atria D The left ventricular wall has hypertrophied

In children with tetralogy of Fallot, why does unoxygenated blood enter the systemic circulation causing cyanosis? A The aorta and pulmonary artery have exchanged positions B Pulmonary valve stenosis changes the ventricular pressure C The septal defect allows exchange of blood between the atria D The left ventricular wall has hypertrophied

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter33: Circulation

Section: Chapter Questions

Problem 15SA: Match the terms with their descriptions. ____capillary a. filters out pathogens ____lymph node b....

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Match the terms with their descriptions. ____capillary a. filters out pathogens ____lymph node b. cardiac pacemaker ____atrium c. blood vessel with valves ____ventricle d. largest artery ____SA node e. receives blood from veins ____vein f. exchange site ____aorta g. receives blood from atrium
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The heartbeat includes: a. the systole when the heart relaxes and fills. b. the diastole when the heart contracts and empties. c. pressure that causes the AV valves to open, filling the ventricles. d. rising pressure in the ventricles to open the AV valves and close the SL valves. e. the lub sound when the SL valves open and the dub sound when the AV valves close.
Visit this site (http://openstaxcollege.org/l/heartvalve) to observe an echocardiogram of actual heart valves opening and closing. Although much of the heart has been removed from this gif loop so the chordae tendineae are not visible, why is their presence more critical for the atrioventricular valves (tricuspid and mitral) than the semilunar (aortic and pulmonary) valves?