The microscope sacs within the lungs are called

Which type of alveolar cells secrete a surfactant to stop the cells sticking together?

What type of alveolar cells are especially thin to allow gas exchange?

What does not happen in inhalation

What does not happen in exhalation

What percentage of lung cancer is caused by smoking?

What percentage of lung cancer is caused by passive smoking?

The main branches from the trachea are called

Patients with emphysema have

As volume of lungs increases, the pressure within it

The trachea is also known as

Oxygen diffuses into the blood capillaries surrounding the alveoli via

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