Which of the following statements are CORRECT with respect to cardiac activity?
A. Nervous control of cardiac activity is brought about by Autonomous nervous system (ANS).
B. ANS receives inputs from proprio-receptors, chemoreceptors and baroreceptors for nervous control of heart beat.
C. Cardiac activity increases with elevated blood levels of \(\text{K}^{+}\) and \(\text{Na}^{+}\).
D. Conditions like hypoxia, acidosis cause increase in cardiac activity.