Bronchitis is
o a gradual destruction of the alveoli.
o an abnormal sensitivity of the airways.
o an inflammation of the bronchial tubes
o a virus that affects the upper respiratory system.

Aproper cool-down routine includes which of the following? a). eating a good-sized meal b. five to 10 minutes of slow walking or jogging and stretching c). less than 5 minutes of cool-down stretches d). sprinting or other strenuous exercise