Choose the false statement concerning the effects of epinephrine-cAMP signaling on various cell types.

stronger smooth muscle contraction.

liver cell glycogen breakdown to glucose.

increase in intestinal epithelial cell fluid secretion.

stronger heart muscle contraction.

inhibition of platelet activation during blood clotting.

Inhibition of platelet activation during blood clotting.

Explanation:

Epinephrine serves as one of the weak agonists for platelets. Binding of epinephrine to alpha-adrenergic receptors serves to stimulate the activation of platelets. It does not inhibit the platelet activation during clot formation. Being a weak agonist, epinephrine can stimulate the platelet activation directly but depends on strong agonists such as thrombin to initiate the process.