Question : TRUE/FALSE 1.The pulmonary circulation carries oxygenated blood from the lungs through : 1417119

TRUE/FALSE

1.The pulmonary circulation carries oxygenated blood from the lungs through the coronary circulation and then into the aorta.

2.The right ventricle pumps deoxygenated blood through the tricuspid valve and into the pulmonary arteries.

3.The aortic valve prevents backflow of blood from entering the left ventricle during ventricular diastole.

4.The mitral valve prevents regurgitation of blood back into the left atrium from the left ventricle.

5.The function of the chordae tendineae and papillary muscles is to hold the AV valves open during diastole to ensure complete ventricular filling.

6.The AV valve controls the amount of blood entering the atrium from the venous system.

7.The SA node is the only part of the heart that can function as the heart's pacemaker.

8.The only point of electrical contact between the atria and the ventricles is the AV valve.

9.An action potential spreads through the atria by gap junctions, but there are no gap junctions present in the ventricles, so the impulse must be propagated throughout the ventricular myocardium by the bundle of His and Purkinje system.

10.An action potential impulse passes through the internodal pathways between the P wave and Q waves on an ECG.