Question

Which of the following statements define a systole?

• A. Expansion of the heart chambers is called systole
• B. Contraction of the heart chambers is called systole
• C. Irregular beating of heart is called systole
• D. None of the above

Answer 1

The correct option is B Contraction of the heart chambers is called systole

The contraction of the heart chambers is called systole.
The expansion or relaxation of the heart chambers is called diastole. The sequence of events that takes place in a cardiac cycle is atrial systole, ventricular systole, ventricular diastole and finally joint diastole.

​​​​​​Irregular beating of heart is called arrhythmia. Its a medical condition in which the heart beats at an irregular pace.