Question 1
Which electrical event happens at the start of a cardiac cycle?
◦ The SA node fires.
◦ The P wave develops.
◦ Atrial systole occurs.
◦ Blood is ejected from the atrium.
◦ Ventricular systole occurs.
Question 2
In order for blood to enter the heart,
◦ the atria must be in diastole but the atrial pressure must be lower than the veins.
◦ the AV valves must be open.
◦ the pressure in the atria must be lower than in the veins.
◦ the atria must be in diastole.
◦ All of the answers are correct.