Question

cardic muscle are involuntary what does it means

Answer 1

Involuntary muscle (or smoothmuscle) is innervated by the autonomic nervous system and therefore is not under conscious control. ... Cardiac muscle is myogenicmeaning muscle fibres can stimulate contractions without needing input from a nerve impulse.

Answer 2

They Don't Act As Per Our Will.
We Can't Control Them as per our will.
Like We Can't Stop the Beating Of Our Heart By Manipulating Cardiac Muscles because they don't volunteer our will they work on their own.