Which statement by the nurse best describes the scientific rationale for how a nonnarcotic antitussive medication works in the body? 1. It suppresses the cough reflex by directly acting on the medulla...

Which statement by the nurse best describes the scientific rationale for how a nonnarcotic antitussive medication works in the body?

1. It suppresses the cough reflex by directly acting on the medulla of the brain. 2. It reduces the cough reflex by anesthetizing stretch receptors in the respiratory passages. 3. Nonnarcotic antitussives slow down the destruction of sensitized mast cells. 4. It acts to block receptors for cysteinyl leukotrienes that prevent bronchoconstriction