Question

Q1. At what point on an EKG semi-lunar valves open?

A. At the "S" Wave B. Throughout the ST segment C. At the "Q" wave

Q2. Which of the following is false regarding isometirc contraction?

A. AV and semi-lunar valves are closed B. The volume of blood in the ventricles is the same as the volume of blood in the Pulmonary artery and aorta.

C. There is no change in blood volume in the ventricles as they contract

Q3. During the QRS wave the ventricles ________________and contract

A. Repolarize B. Hyperpolarize C. Depolarize

Q4. The volume of blood left in each ventricle after the ventricles contract is called?

A. Afterload B. End diastolic Volume C. End systolic Volume D.Stroke volume

Q5. Which chambers repolarize during the T- WAVE?

A. The left atria and ventricle B.The atria C. The ventricles

Answer 1

1. C. At the Q wave.

Semilunar valves are open when the ventricles muscle contraact, and this is represented by QRs complex.

2. B. . The volume of blood in the ventricles is the same as the volume of blood in the Pulmonary artery and aorta.

In isovolumetric contraction all valves are closed, there is no change in the ventricular volume because all valves are closed during this stage.

3.C) depolarize

Depolarization causes contraction, and contraction of the ventricles are represented by QRS complex.

4. C) end systolic volume

End diastolic volume is the amount of blood in the ventricles before contraction, while the amount of blood left inthe ventroicles after ventricles contract is End systolic volume

5. C.) The ventricles.

The T waves represents ventricular repolarization and relaxation of ventricular muscles.