Identify the number of lobes in the left lung: (R3)

Gas exchange between the atmosphere and tissues is necessary because of cellular respiration. (R1)

The serous membrane around the lung. (R3)

The ____ is the opening into the larynx. (R3)

As carbon dioxide levels rise in the blood, pH __. (R13)

Decreasing pressure within the thoracic cavity causes air to move _______ the lungs. (R7)

The ______ produces surfactant. (R5)

All of the following conditions decrease the efficiency of external respiration except… (R11)

Moving air in and out of the lungs is: (R6)

The ____ is/are the most superior structure of the lower respiratory tract