negative regulation of atrial cardiac muscle cell action potential
down regulation of atrial cardiac muscle cell action potential
exact
down-regulation of atrial cardiac muscle cell action potential
exact
downregulation of atrial cardiac muscle cell action potential
exact
inhibition of atrial cardiac muscle cell action potential
narrow
Any process that stops, prevents or reduces the frequency, rate or extent of atrial cardiac muscle cell action potential.
GO:0045759
negative regulation of action potential
is_a
GO:0098910
regulation of atrial cardiac muscle cell action potential
is_a
GO:0106135
negative regulation of cardiac muscle cell contraction
is_a
GO:0086014
atrial cardiac muscle cell action potential
negatively_regulates