Question

Ans.
The terms systole and diastole refer to: (1 marks)
the major artery and vein from and to
the heart
heart contractions and relaxations
rates of heart pulse
sounds from the heart​

Answer 1

Answer:

heart contractions and relaxations is the correct option

Answer 2

Answer

The terms systole and diastole refer to heart contractions and relaxations.

The contraction of heart is called systole and the relaxation of the heart is called diastole.

Know more :

$\bigstar$ The sequence of cyclical events which takes place between a systole and a diastole of the heart is called cardiac cycle.

$\bigstar$ Cardiac cycle involves 3 phases systole, diastole and joint diastole.

$\bigstar$ The volume of blood pumped by left ventricles or right ventricle during each systole is called stroke volume.