When a heart attack occurs, heart tissue enzymes begin to show up in the bloodstream. On the third day, physicians expect to find increasing levels of:

Troponin is an enzyme that will be present

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.

true

explanation: