Understanding EKGs - Ch 2 Exam Solved 100% Correct

Freshly oxygenated blood traveling through the aortic valve also enters the ________ ______ during diastole when the aortic valve closes to accomplish myocardial oxygenation. - ANSWER-Coronary arteries What is the VITAL function that occurs in the 2nd or middle component of pulmonary circulation? - ANSWER-gas exchange What is characterized by gas exchange? - ANSWER-Carbon dioxide is exchanged for oxygen in the pulmonary alveolar-capillary network. What is the cardiac cycle? - ANSWER-The actual time sequence between ventricular contraction and ventricular relaxation. What is systole or ventricular systole? - ANSWER-Simultaneous contraction of the ventricle. What is diastole? - ANSWER-Synonymous with ventricular relaxation. Why does the heart function as a unit? - ANSWER-Because both atria contract simultaneously, then both ventricles contract. What happens when the atria contract? - ANSWER-The ventricles are filled with blood to their limit. What happens when simultaneous contraction of the ventricles occur? - ANSWER-Blood is ejected into the pulmonary and systemic circulations systems. During ventricular contraction, what is occuring to the mital (bicuspid) and tricuspid valves and the pulmonic and aortic valves? - ANSWER-The mital (bicuspid) and tricuspid valves are closed by the pressure of the contraction, while the pulmonic and aortic values open. How much blood fills the ventricles during ventricular diastole? - ANSWER-70% of the blood that has collected in the atria fills the ventricles during ventricular diastole. What happens to the remaining 30% of the blood? - ANSWER-The active contraction of the atria propels the remaining 30% of the blood into the ventricles. What happens during periods of ventricular relaxation? - ANSWER-Cardiac filling and coronary perfusion occur passively.