Extrinsic regulation of cardiac activity...

Extrinsic regulation of cardiac activity is brought about by

Thyroxine and nodal tissue

Epinephrine and Thyroxine

Sympathetic division and nodal tissue

Nodal tissue and epinephrine

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Closure of stomata is brought about by.

Abscisic acid

kinetin

Giberellin

IBA

flow of information

aggregation and interaction

entropy and flow of energy

aggregation, interaction, equilibrium and change

flow of material

flow of energy

flow of information

flow of both energy and information