Lab Quiz #1 heart sounds and ECG

Question 1

what is the first sound of the heart caused by?

Answer 1

closing of the atrioventricular valves as the ventricles contract

Question 2

what is the second sound of the heart caused by?

Answer 2

closing of the semilunar valves as the ventricles relax

Question 3

what may heart murmurs be caused by?

Answer 3

defects in the heart valve

Question 4

what does the P wave represent

Answer 4

depolarization of the atrium

Question 5

what does the T wave represent

Answer 5

repolarization of the ventricle

Question 6

what does the QRS complex represent

Answer 6

depolarization of the ventricle

Question 7

what is not represented by an ECG and why?

Answer 7

the repolarization of the atrium because it can’t be seen, it’s behind the QRS complex

Question 8

if the probe ends in the left atrium what valve is it going through?

Answer 8

the pulmonary vein

Question 9

if the prove ends in the right atrium what valve is it going through?

Answer 9

vena cava

Question 10

if the probe ends in the left ventricle what valve is it going through?

Answer 10

aorta

Question 11

if the probe ends in the right ventricle what valve is it going through?

Answer 11

the pulmonary trunk