when giving breaths during high-quality cpr, each breath should last about 1 second and make what happen?

When giving breaths during high-quality CPR, each breath should last about 1 second and should make the chest visibly rise. This indicates that air is entering the person's lungs effectively. If the chest does not rise, it suggests that the airway may be blocked or the breath was not delivered properly, and adjustments such as retilting the head and ensuring a proper seal should be made before giving the second breath