Heart & ECG Lab Verified Solutions 2023.

Heart & ECG Lab Verified Solutions 2023.How many chambers does the heart consist of? - ANSWER 4 Which ventricle pumps blood through the aorta to the body? - ANSWER left ventricle What is the correct order the flow of blood entering the heart from the systemic circulation through the venae cava? - ANSWER 1. right atrium 2. right ventricle 3. pulmonary trunk 4. pulmonary veins 5. left atrium 6. left ventricle The mitral (or bicuspid) atrioventricular valve controls the flow between the: - ANSWER left atrium and ventricle The electrical impulse is delayed in the AV node before propagating to the bundle of His. During this delay the _________ contract - ANSWER atria ________ is the phase of the cardiac cycle when the heart is relaxing - ANSWER diastole A cardiac cycle covers the events that occur from the beginning of one heart beat to the beginning of the next - ANSWER true _________ impulses stimulate cardiac muscle to contract - ANSWER electrical After contracting, the heart relaxes. This happens because of an electrical change called ___________ - ANSWER repolarization What does an ECG measure? - ANSWER electrical impulses The electrical activity that occurs in the heart when it contracts and relaxes can be recorded, and is called a(n) _________ - ANSWER electrocardiogram What is the function of the four heart valves? - ANSWER they allow the blood to flow in only one direction through the heart Which valves are located between the atria and the ventricles? - ANSWER atrioventricular (AV) valves Which valves are located between the exits of the ventricles and the two large arteries? - ANSWER semilunar valves How are the sounds of a heartbeat created? - ANSWER by heart valves closing What is happening in the heart during the second heart sound ("dupp")? - ANSWER semilunar valves are closing The first heart sound, "lubb", is associated with the closing of which valves? - ANSWER atrioventricular (AV) valves The first heart sound, "lubb" is heard when the AV valves close, and this is related to the _________ on an ECG - ANSWER QRS complex At which point on an ECG is the second heart sound, "dupp", heard? - ANSWER the end of the T wave At which point on an ECG is the first heard sound, "lubb", heard? - ANSWER during the QRS complex The second heart sound "dupp" is heard when the semilunar valves close, and this is related to the ________ on an ECG - ANSWER end of the T wave The semilunar valves are closing during ventricular _________ - ANSWER relaxation (diastole)