Question

A. Do any heart sound occur during the P wave? yes or no

B. During the QRS wave, the atria repolarizes and ___________ . relax or contract

C. During the QRS wave, blood entering the ventricles from the atria causes the initial (increase or decrease) in ventricular pressure. decrease or increase

D. During the QRS wave, what happens when the pressure in the atria exceeds the pressure in the ventricles? semi-lunar valves close, AV valves close,or AV valves open

E. During what part of the EKG is the first heart sound heard? S, R, or Q

F. The amount of blood in each ventricle at the end of ventricular systole is referred to as preload. The resistance that the preload must be pumped against in order to be ejected is referred to as the _________________. After load, stroke volume, end diastolic volume, end systolic volume.

G.

Are these 2 statements True or False?

1. The ventricles contract from the R wave to the end of the T wave.

2. The ventricles relax from the end of the T wave on one cycle to the "R" wave on the next cycle.

H. One cardiac cycle is one contraction and relaxation. It is measured from: start of P wave on one cycle, to start of P wave on another, from P to end of T, from R to R, or from R on one cycle to P on following cycle.

Answer 1

A. No

Explanation: first heart sound occurs after the P wave due to closure of the Av valves preceding the ventricular systole.

B. During the QRS wave, the atria repolarizes and __Relax_________

C. During the QRS wave, blood entering the ventricles from the atria causes the initial increase in ventricular pressure.

d. when the pressure in the atria exceeds the pressure in the ventricles, AV valves open.

E. Q wave

explanation: At Q wave ventricular systole begins with closure of AV valves causing first heart sound.

F. The amount of blood in each ventricle at the end of ventricular systole is referred to as preload. The resistance that the preload must be pumped against in order to be ejected is referred to as the ______Afterload___________.