Question

During systole of the heart

• A. Only auricle contract
• B. Only ventricle contract
• C. Auricles and ventricles contract separately
• D. Auricles and ventricles contract simultaneously.

Answer 1

The correct option is C

Auricles and ventricles contract separately

The correct option is (C)

Explanation of the correct option:

1. During systole, first the auricles contract then the ventricles.
2. The blood from auricles reaches the ventricles after which the ventricles contract.

Explanation of the incorrect options:

Option (A)

1. When the right auricle relaxes deoxygenated blood enters it and when it contracts the blood gets into the right ventricle.
2. When the left ventricle relaxes oxygenated blood enters it and when it contracts the blood moves to the left ventricle.

Option (B)

1. When the ventricles contract right ventricle pumps blood to the lungs and the left ventricle pumps blood to the rest part of the body.

Option(D)

1. Auricles and ventricles contract simultaneously during premature contraction.

Final answer: During systole of the heart auricles and ventricles contract separately.