Assertion `:` During diastole, ventricles receives blood from auricles.
Reason `:` During ventricular diastole (stage of rapid inflow) the pressure inside auricles is greater than ventricles.

During diastole auricles receive :-

Assertion (A): The muscular walls of ventricles are thicker than auricles. Reason (R): This helps in preventing the back flow of blood.

Assertion : Systolic pressure is higher then diastolic pressure. Reason : Arteries contract during systole of heart.

Assertion : Systolic pressure is higher then diastolic pressure. Reason : Arteries contract during systole of heart.

Assertion : First heart sound (LUBB) is produced at the beginning fo ventricular systole stage. Reason : During ventricular systole semilunar valves are closed.

Assertion : The shape of a liquid drop is spherical. Reason : The pressure inside the drop is greater than that of outside.

Assertion : First heart sound (LUBB) is produced at the beginning of ventricular systole stage. Reason : During ventricular systole semilunar valves are closed.

Assertion : Work done during free expansion of an ideal gas whether reversible or irreversible is positive. Reason : During free expansion, external pressure is always less than the pressure of the system.