Expiration occurs when the thoracic and intrapulmonary volumes decrease and the intrapulmonary pressure increases.

Changes in oxygen levels in the blood are the most important stimuli for breathing in a healthy person.

Which one of the following is NOT true of inspiration:

Where are the respiratory centers housed which control involuntary breathing rates:

Changes in oxygen levels in the blood are the most important stimuli for breathing in a healthy person.

The nasal cavity is separated from the oral cavity by the nasal conchae.

_____ – carry lymph from peripheral tissues to the venous system

Which one of the following is NOT a mechanism that aids lymph return:

Where are the tonsils located:

Allergies, or hypersensitivities, are normal immune responses.