unit 3 heart cycle

Question 1

atrial and ventricular diastole

Answer 1

the AV valves are opened, the SL valves are closed

Question 2

atrial systole (the atrial kick)

Answer 2

accounts for 10-30% of cardiac output. the AV valves are open and the SL valves are closed. at the end, the AV valves close due to increased pressure in the ventricles. this creates the lub (s1).

Question 3

ventricular systole

Answer 3

the ventricles contract while the atria are in diastole. ventricular pressure overcomes atrial pressure, which opens the SL valves and closes the AV. when the SL valves close at the end due to increased atrial pressure, the dub (s2) occurs. all valves close at the end of this stage.

Question 4

ventricular diastole

Answer 4

atria and ventricles are diastolic. when atrial pressure rises over ventricular pressure, AV valves open.

Question 5

circumflex

Answer 5

circles around the lateral wall to the left lateral/posterior wall.

Question 6

left anterior descending artery

Answer 6

goes to the left anterior wall

Question 7

right main coronary artery

Answer 7

starts at the right ventricle, goes to the left interior/posterior wall.

Question 8

what is the position of the AV valves during ventricular systole

Answer 8

closed.

Question 9

when the AV valves close what direction do they move? when they open?

Answer 9

up. down.

Question 10

what is the position of the AV valves during ventricular diastole

Answer 10

open

Question 11

what is the position of the SL valves during ventricular systole

Answer 11

open

Question 12

what is the position of the SL valves during ventricular diastole

Answer 12

closed

Question 13

when the SL valves close what direction do they move? when they open?

Answer 13

downward. upward.