if all cardiac cells are said to have autoexcitability and self stimulatory effect, how can they respond to a stimulus coming from outside (like san or stimuli from medulla )? They have leak channels and not chemical gated channels

if all cardiac cells are said to have autoexcitability and self stimul

1.	if all cardiac cells are said to have autoexcitability and self stimulatory effect, how can they respond to a stimulus coming from outside (like san or stimuli from medulla )? They have leak channels and not chemical gated channels
Answer» if all cardiac cells are said to have autoexcitability and self stimulatory effect, how can they respond to a stimulus coming from outside (like san or stimuli from medulla )? They have leak channels and not chemical gated channels