Select the true statements about eicosanoids. Eicosanoids are transported in the blood…

Select the true statements about eicosanoids.
Eicosanoids are transported in the blood stream to their site of action.
High concentrations of eicosanoids are necessary for effective action.
Eicosanoids are responsible for regulating the sleep/wake cycle.
Arachidonic acid, a 20-carbon fatty acid, is the precursor to eicosanoids.
Eicosanoids are broken down within seconds to inactive residues.