TRUE or FALSE 1. Basic gas-exchange unit of the Respiratory system is the bronchioles. 2. The trapezius and pectoralis stabilize shoulders. 3. In the Main stream bronchi, the left is more vertical. 4. In gas exchange area the blood takes O2, gives off CO2. 5. Alveolar stretch receptors respond to inspiration by sending signals to inhibit inspiratory neurons in the brain stem to prevent lung