In order for blood to enter the heart,

[geodog55]

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.

[gabrielle_lawrence]

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[geodog55]

Thanks for the timely response, appreciate it

[marict]

Great answer, keep it coming